Isaacs Fury II

Transcription

Isaacs Fury II

Isaacs Fury II
MADE IN THE USA
Information
package
$10
an English homebuilt biplane
USA Made premium Short Kit offering from
Scale Built R/C in Keller, Texas
A 30% scale R/C miniature aircraft featuring exact scale construction
and outlines. Wood structure. Computer drawn from the designer’s
drawings with a 3D Solid Modeling CAD system.
Photo from owner of
our subject aircraft.
Photo of the full-scale Isaacs Fury II. It has a 21 ft top wing and all wood construction. Aircraft is a 7/10 scale version of the famous Hawker Fury biplane fighter used by the British in the 1930’s. Powered with a 125 HP Lycoming
engine. Designed for aerobatic flying and has a semisymetrical airfoil. It is slightly bigger than a Pitts Special.
ur Fury II is designed for serious national and international scale competition. Our model is engineered
O
using modern solid modeling (3D) CAD software. The
actual full-scale Fury II plans are being duplicated in a
30% scale. Minor changes have been made because of
material sizes of available wood, metal, tubing and fasteners. Readily available materials are used in the structure.
A complete detailed cockpit interior has been duplicated in
our model. Control stick and rudder petals move. Left side
cockpit door opens. No radio equipment can be seen in
the cockpit area. Six servos are used. 7” Vintage wheels
available from several model manufactures.
The fuselage is built from spruce stringers and covered
with 1/32” plywood. Wings feature two full depth spruce
spars with diagonal wood braces. Entire aircraft covered
with light weight fabric. Ailerons are in the top wing only.
1/32” dia. cables are used for the flying wires (full-scale
uses cables). The cables attach with clevis pins and are
easily disconnected from the wings for quick disassembly.
Wingspan of upper wing is 75 inches.
The cowl width is 10 1/2 inches. Use 40-50cc engines.
Several twin cylinder engines can be used. .016”
Aluminum sheet is used for the cowl and the removable
coverings above and below the gas tank area.
Full size plans, detailed on-line PDF file instructions with
illustrations and laser cut LitePly ribs and bulkheads will be
offered. Some special parts will be offered too. Photo documentation for the subject aircraft is also available on line..
S C A L E B U I LT R / C • P O B o x 1 3 2 7 • K e l l e r , T X 7 6 2 4 4 - 1 3 2 7
817-431-1038 • WEB: www.nelsonhobby.com
Brochure: Date Revised: 10/30/10
USA
Scale Built R/ C
A division of Nelson Aircraft Co.
PO Box 1327 • Keller, TX 76244-1327
817-431-1038
www.nelsonhobby.com
Full-Scale Iaascs Fury II
AN INTRODUCTION
by Jerry Nelson
President, Nelson Aircraft Co.
June 15, 2010
Dear Modeler:
Our Isaacs Fury II biplane offering is intended to fill the need for someone who would like to have an excellent custom flying scale model that is unique. A model that the other guys at the flying field don't have.
The construction of our Fury II prototype will be started in a few months. Still a little more work to do on
the Solid Modeling drawing and then the making of the actual construction drawings. Hope to have a flying prototype sometime late this year. We will take plans orders soon as they are finish. Price unknown at this time.
The flying performance of our Fury II should be outstanding and also be very competitive in beginning levels of IMAC aerobatic competitions. And, it should be a top contender at major scale competitions such as the
Scalemasters and Top Gun as well as international competitions. Also would qualify for War Bird Fly-Ins.
This model is a flyable "Miniature Airplane". It is not a typical scale model airplane. Our definition of a
miniature airplane is one that has nearly the same scale construction, design, and materials of the full-scale aircraft, and has scale dimensions of the exterior as the interior. Our marketing name of Scale Built R/C will be used
to promote “scale inside and scale outside” miniature R/C aircraft.
We are offering the builder the experience of building a scale model in the same manner as if building the
full-scale aircraft. Our Fury II project and others to follow are designed from the actual full-scale drawings. A simple three view may not be accurate and may be of little value in the producing an exact scale "Miniature Airplane".
Our facilities at this time are not suitable to offer a full kit. Instead what will be offered is a short kit including laser
cut ribs and bulkheads and full-size plans. The instructions and 8 1/2” by 11” drawings of the full size smaller parts
will be offered on-line as a PDF file. If sufficient interest in the Fury II is generated, additional items may be available such as a fitting kit, landing gear and tail skid, and a fiberglass nose bowl.
We also understand that in today's market place, many modelers do not build their own airplanes. Instead
many of them contact custom builders to build their models. We will offer a list of custom builders that are interested in building our Fury II biplane for customers.
Hopefully in the future there will be a group of "Miniature Airplane" owners that will bond together to form
a new model organization. Perhaps the group could be called MAA, or the Miniature Aircraft Association. It would
be set up much like the EAA, the Experimental Aircraft Association. A newsletter would be created to disseminate
information about the building and the flying of Miniature Aircraft. For now, that's all in the future.
Sincerely,
Jerry Nelson
Brochure: Date Revised:9/6/10
Page 2
Scale Built R/ C
Fury II Engineering and
Sales Information
Note: This information brochure is not complete. It will be constantly updated as we
progress with the designing and construction of the prototype aircraft.
30% scale Isaacs Fury II
Designed by Jerry Nelson
Basic construction; wood with
fabric covering
Wing Span 75”
Dihedrial Top Wing 1 1/2°
Dihedrial Bottom Wing 3 1/2°
Incidence Wings +3°
Incidence Stabilizer +2°
Wing Area 1700 sq.in.
(Top 919 sq.in-Bottom 781 sq.in.)
Airfoil RAF28
Fuselage Length 67”
Engine Size 40-50cc
Right Thrust 1°
Servos Reqd 6
Weight 23 lbs (estimated)
This is our computer generated three view
created from all the individual parts from our
main assembly drawing for our Fury II.
Located on page 17, is a published three
view of the homebuilt Fury II. Note the
accuracy of our three view with the
published one.
S C A L E B U I LT R / C • P O B o x 1 3 2 7 • K e l l e r , T X 7 6 2 4 4 - 1 3 2 7 U S A
Page 3
ABOUT THE ISAACS FURY II
was about the size he wanted.
he aircraft shown on the bottom of this
page is our subject aircraft. Actual British
registration number of this aircraft is G-BEER.
After the drawings were completed, a complete
stress analysis was done to make certain that the
structure meet the full aerobatic requirement of 9
G’s.
T
The homebuilt Fury II was designed by John Isaacs,
a college engineering professor in England. The
idea for the Fury I originated with the Currie Wot
homebuilt. The Wot is a simple all wood homebuilt with
looks that the British called
“angular lines”. The Wot did
perform well and was well
respected for its structural
design, but not for its appearance.
The airfoil selected is the RAF28 slightly modified at
the trailing edge area. The RAF28 is a semisymetrical airfoil which allows for
good aerobatics.
The original Isaacs Fury I
was powered with a 65 HP
Mikron III 4-cylinder in-line
engine. The cowling looks
quite similar the type used
on the Tiger Moth biplane.
Mr. Isaacs conceived the Original Isaacs Fury I biplane. Powered with a 65 HP 4- The original Fury flew well
idea to use the basic proven cylinder in line engine. The present Fury II is basically the but was underpowered for
all wood structure of the Wot same aircraft with changes made to use 125 HP 4-cylin- aerobatics. However even
and use the outline of the, der opposed engines. All silver finish with white numbers. though it was underpowered,
well known in England, Hawker Fury biplane fighter it was capable of hesitation rolls.
which was England’s top of the line fighter in the
late 1930’s. The Fury fighter was and perhaps still is
a very good looking biplane. It had in 600 HP water
cooled in line engine completely cowled in. A somewhat
large
needle nose
s p i n n e r
added to its
good looks.
After doing
some preliminary
engineering
of
the adapting
the outline of
the Fury fighter
biplane
fighter,
he
decided
to Photo from British
Aircraft Register
make his Fury
a 7/10 scale of the Fury biplane fighter. This provided a similar size aircraft to the Wot and he was
able to use the engineering of the Wot’s structure. A
7/10 scale provided a wing span of 21 feet, which
During the early 1990’s Mr.Isaacs made some
modifications to the aircraft and redesigned the
engine installation to provide for flat four cylinder
engines of 100-125 Hp. This version of the Fury was
called
the
Fury II. The
Fury II version
has
been built by
several people
and in
several countries. Most of
the aircraft
have
used
Lycoming or
Continental
95-125 HP
engines. The
Subject Aircraft h o m e b u i l t
Fury II’s have the same overall outline, but from the
firewall forward there are many different versions.
The subject aircraft that was chosen for our project
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has a cowl very similar to a Pitts Special. Some of
the Fury II’s have the cylinders protruding out just
like you would find in a Piper Cub.
We have corresponded by email with the owner of
the subject Fury II aircraft. He is a retired airline
pilot. He use to own and fly a Yak 55 aerobatic aircraft and is very proficient in full-scale aerobatics.
He
was
asked what
kind
of
maneuvers
have you performed
in
your Fury II.
He has done
all the variations of rolls,
most positive
G maneuvers
like
loops,
cuban eights,
from British
imelmanns, Photo
Aircraft Register
snap
rolls,
and spins. The British government only allows up to
3-turn spins for the Fury II aircraft. His Fury II, like all
the others in England, do not have an inverted
fuel/oil system. When he first flew it inverted, he said
fuel started coming out of the gas cap in front of the
windshield, and got all over the windshield and himself. Not a
good idea to
fly inverted.
of this page is an example of a “civilian” version of
the Fury II.
There is documentation showing that the original
Fury was flown in an international aerobatic competition, thus allowing our Fury II to be entered in
IMAC aerobatic competitions.
Our Fury II
can also be
entered
in
War
Bird
competitions
and fly-ins.
The British
government
considers the
Isaacs Fury II
to be a replica of the
1 9 3 0 ’ s
Hawker Fury
biplane fightSubject Aircraft
er. Thus qualifying it as a “War Bird”. The large registration numbers required by all British civilian aircraft do not
have to be applied when the homebuilt Fury II’s
have been painted in the typical military paint
scheme used in the late 30’s.
DESIGN
CONSIDERATIONS
The builder
o
make
of our Fury II
our Fury II
has
the
a flyable and
option
to
buildable
individualize
miniature airhis/her Fury
craft, we have
II by selecttaken some
from
ing a differ- Photo
liberties
to
British
ent subject Aircraft
modify
the
aircraft. All Register
construction.
of the full- Nicely done Fury II with exposed cylinders. Only clear dope on the fabric covered A
major
scale Fury surfaces. Many Fury II’s have a tail wheel. Main wheels can be different too.
d e s i g n
II’s that I
change, that
have photos of, have different paint jobs or at least is not observable in our model, is the ability to easdifferent marking numbers. The photo on the bottom ily take the wings off and on back on and to
T
S C A L E B U I LT R / C • P O B o x 1 3 2 7 • K e l l e r , T X 7 6 2 4 4 U S A
Page 5
remove the N-Struts and flying wires. Obviously
the full-scale aircraft did not require the easy
removal of the wings after each flying session.
Another major change is the engineering of the
installation of the radio control equipment/control
linkage, and providing for the model airplane
engine and its removable gas tank.
Some structural sizes and selection of materials
had to be changed as well. Many scale sizes are
not available and we had to select sizes that were
as close to scale as possible. Ribs are from 1/8”
LitePly. Not scale, but very practical.
part of our outstanding on-line instruction manual.
We can present the showing of any part, subassembly, and final assembly in any angle or
viewing orientation. The manual will be updated on
a regular basis. The builder will always be able to
down load the latest instructions.
The illustrations are color coded to make it easy to
view the different parts. The color code is: Birch
plywood (Copper), LitePly (Khaki), Balsawood
(Yellow), Spruce (Tan), Aluminum (Silver), Brass
(Brass), Steel (Blue), Threads (Green), Rubber
(Black). Some exceptions are found.
INSTALLATION OF R/C EQUIPMENT
USE OF SOLID MODELING CAD
SOFTWARE
ot only do we have to provide for the mounting
of the six servos, receiver (or up to 3 of the 2.4
GHZ types), batteries, switches, charging jacks,
but more importantly we have to be able to remove
these items for service or replacement. And, perhaps even more of a design challenge is keeping
the
R/C
equipment
hidden from
view
when
looking into
the cockpit.
N
professional quality 3D computer assisted
drawing (CAD) solid modeling software is
used to design our Fury II. This software is state of
the art and
used by a
large number of major
companies
throughout
the world.
A
Other than
the obvious
use of this
software to
design our
Fury II and
provide the
necessary
drawings to
fabricate the
various com- This and the other illustrations are
ponents, it generated drawings of our Fury II.
allows us to
provide illustrations of subassemblies and complete
assemblies, and even the competed aircraft in a 3D
photographic type presentation. Also known is the
weight of the aircraft and its center of gravity.
Examples of the illustrations are shown throughout
this presentation. These illustrations are the main
An
eight
channel radio
is suggested
as a minimum
system to use
in our Fury II.
This should
allow the mixing of the two
individual
aileron servos
computer
together
which
will
allow the individual adjustment for differential aileron deflection.
Two elevator servos are attached to a micarta trim
bar that outputs to a single scale bellcrank assembly that drives the independent elevator pull-pull
cables. The trim bar assembly is part of the servo
tray. The two elevator servos can be mixed togeth-
Page 6
er thereby eliminating the need for them to be both
plugged into a less efficient Y harness. With this
type of elevator control linkage, If one of the elevator servos
should fail,
then there is
still
partial
elevator control available.
The
flight
control servos should
be of the
heavy duty
type
and
have at least
125
inch
ounces
of
o u t p u t
torque. A 2.4
GHZ
radio
system will
be used in
our prototype Fury II. The receiver(s) along with
the switches and charging jacks will be placed in a
plywood scale baggage compartment behind the
rear seat.
The receiver
battery(s) is
located
in
front of the
instrument
panel and its
access
is
obtained by
removing the
instrument
panel. The
elevator servos are located behind the
removable
seat. They
are attached
to an aluminum tray
that also con-
tains the sliding trim bar for dual elevator servo
redundancy. The tray is held in position with two
pieces of 3/16” diameter aluminum tubing acting
as
rails.
When
the
rails
are
pulled out,
the servo tray
can be pulled
forward into
the
empty
cockpit area.
Prior
to
removing the
servo
tray
a s s e m b l y,
the
short
pushrod
going to the
elevator bellcrank
is
removed
from the trim
bar. Access to the removal of the trim bar pushrod
is obtained by a hatch opening in the bottom sheeting right under the two elevator servos.
The rudder servo is attached to a permanently
mounted aluminum tray
l o c a t e d
behind the
elevator servos. The rudder servo can
be removed
with a hatch
opening similar to the one
for
the
removal of
the elevator
servos.
The throttle
servo
is
planed to be
mounted
Page 7
underneath
the gas tank
just behind
the firewall.
There is a
scale removable
aluminum cover
to
allow
access to the
throttle servo
servo.
e n g i n e s
would be the
ST4500 converted
to
spark ignition
and the use
of gasoline,
and
the
OS160 also
converted to
spark ignition
and gasoline.
Engine used
should be in
the 4 HP+
power range.
The ignition
module and
its battery are
located
in
another scale
removable
aluminum
cover
just
above the gas tank and behind the firewall.
JIGS REQUIRED FOR
CONSTRUCTION
Our Fury II is intended to be a competition scale
model. For maximum static points, it is desirable to
have all the radio equipment is hidden from view.
The radio equipment is somewhat difficult to
remove. In a practical sense it is unlikely that
removable of the radio equipment will not be done
on a regular basis. However, the equipment can be
removed if necessary.
imple particle board jigs will have to be made.
These will be used to build the tail group, wing
panels, as well as the basic fuselage structure.
There will be a few alignment jigs to set up the incidence for the cabine structure and for the proper
Dihedrial for the wing panels.
INSTALLATION OF ENGINE
ITEMS SUPPLIED IN OUR SHORT
KIT
everal engines can be used. Engines that
would be ideal for our Fury II are the OS and
Saito 300 4-cycle twins. It may be possible to
install the 4-cylinder OS Pegasus 4-cycle engine.
Several of the 40-45cc single cylinder gas engines
can be used and still fit into the 10 1/2” wide cowl.
S
A rough outline of a Fuji 43cc engine is temporarily shown in our drawings. The engine is slightly
rotated to the left so that the spark plug goes into
the air scoop at the bottom of the cowl. A wide
selection of single cylinder engines can be used if
the spark plug lead is allowed to protrude outside
of the cowling. The Aerovate 52cc twin fits perfectly within the cowling. Another possible selection of
S
ecause of our limited production space, a full
kit is not planed to be offered. The Fury II short
kit will include the following.
B
• Laser Cut LitePly ribs and non built up bulk
heads.
• Full-size assembly drawings computer printed.
Estimated that there will be six to seven 24” x 36”
or 48” full size detailed drawings showing the top
view of the wing panels, stabilizer, and fuselage.
There also will be side views of the fuselage, vertical fin, and rudder. Additional drawings will provide
full-size drawings of the landing gear, cabine and
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N-Struts, elevator servo tray, etc. Full-size pattern
drawings are provided for the cutting out of the various parts.
• Complete list of all parts.
• List of sources for materials required.
ITEMS AVAILABLE ON-LINE
• INSTRUCTION MANUAL: A comprehensive
instruction manual will be available at no charge by
down loading it as a PDF file. The manual will be
divided into several sections; Upper Wing, Lower
Wing, Fuselage, and Tail Group, and
Miscellaneous.
The manual will feature a large quantity of illustrations showing a step by step process as the various assemblies are constructed. All the illustrations will be in color if a color printer is available.
The manual will be updated on a on-going basis.
This will assure the builder that the latest information is available.
For those without a computer and printer, printed
copies of the instruction manual will be available
for a fee. The cost of printing out the instructions is
quite high and we highly recommend that if the
builder doesn’t have a
computer, find
someone or a
source
that
can print out
the
instructions.
• SMALL SIZE
8 1/2” x 11”
D R AW I N G S
(A-Size):
There is a
individual full
size drawing
for all the
small
parts
that can be
shown full size
in this size of drawing format. Parts to big to be
placed in the A-Size drawings will be shown on the
larger D-Size drawings. Some of the drawings will
be enlarged or reduced in size if appropriate.
These A-Size drawings can also be made available for a fee. Again the cost of doing so is quite
high due to the time involved. There may be over
a fifty A-Size drawings. Many of these parts on
drawings don’t have to be printed out as they are
simple items that only the dimensions are needed.
An example may be a tubing spacer that is 1/4”
diameter and 3/8” long.
ITEMS THAT REQUIRE SOME
MACHINING WILL BE AVAILABLE
FOR PURCHASE
e will be offering some Fury II part items.
More items may be offered as demand indicates. For what ever reason, some of the parts
may be difficult for some to reproduce in a home
work shop environment. The unique parts of our
Fury II can easily be made by an advanced model
builder used to building from plans or complex kits
that don’t have very good instructions.
W
The following items will be available when the
plans
are
r e a d y .
Prices are
not
available at this
time. A separate item
list
and
prices will
be available
when
the
plans
are
ready.
View showing an approximation of the outline of a Fuji
43 engine. Engine is at a slight angle for the spark
plug to clear cowl. 1 degree right thrust is built in.
Engine mounted on a 3/16” aluminum plate which is
bolted to the engine mount box assembly. This
assembly also has room for a 24 once gas tank. Tank
is removed by removing the engine. Note the numerous metal brackets used for reinforcing and attachments. Engine mounting box assembly easily modified in length to fit other engines.
Page 9
Servo
Trays
Our Fury II
servo trays
are
an
important
items in the installation of the servos. The trays
allow us to install the servos such that they cannot
be seen and still are removable for service or
replacement.
The trays can be made in a home workshop enviroment without any special tools or machinery. All
one needs is a band saw and a drill press and
common hand tools.
The bending of the flanges on the trays is done by
clamping the aluminum base to the edge of the
workbench and then with a hammer and a block of
wood, form the angle. Accuracy is not critical. We
have detailed drawings and instructions for making
them.
The instructions for making the trays also provides
information for making the trays without bending
the flanges. Aluminum angles are used for the support necessary support. Also instructions are given
for making the elevator and rudder trays from 1/16”
Note how our
H.D. servo arm
is attached the
the servo’s
nylon output
wheel. Typ. all
servos.
Rudder Tray Assy.
Note: Rudder tray
is actually installed
upside down in the
fuselage.
Rudder Servo Tray Assembly.
This will include the preformed plated 1/32” thick
2024T-3 aluminum main frame, one 1” servo arm
for JR, Airtronics, Hitec, or Futaba standard size
servos, and necessary hardware items for
installing the servo and mounting it to the fuselage.
Frame is
made from
1/16” x 1” aluminum angle.
1/8” Thick
Phenolic trim Bar
Aileron Tray Assy.
Front
Elevator Tray Assy.
Aileron Servo Tray Assembly.
Includes two plated aluminum 90 degree angle
main frames, two 1”servo arms for JR, Airtronics,
Hitec, or Futaba standard size servos, and necessary hardware items for installing the servo and
mounting to the wing panel.
birch plywood base and spruce for supports.
Elevator Servo Tray Assembly.
This will include the preformed plated 1/32” thick
2024T-6 aluminum main frame, two plated aluminum angle trim bar guides, 1/8” thick phenolic
trim bar, two 3/4 inch servo arms for JR, Airtronics,
Hitec or Futaba standard size servos, and all the
various hardware items such as ball links, nuts,
screws, washers, nylon spacers, etc.
1” Rudder and aileron
servo arm.
3/4” Elevator servo
arm.
Heavy Duty Servo Arms
We have made these type of heavy duty servo
Page 10
arms for many years. They are made from 1/16”
2024T-3 aluminum and are plated. Offered for the
Fury II is a set of five 3/4” and 1” arms for JR,
Airtronics, Futaba, or Hitec standard type servos.
These arms bolt directly on to the existing nylon
servo wheel. All hardware is supplied including ball
links and miniature elastic stop nuts.
4-40 Right hand and 4-40 left hand
threaded stud 5/8” long made from
1/8” dia. steel or brass rod.
4-40 Stud 5/8” long
Right hand
4-40 Left hand
side
Clevis pin 3/32” dia
x 1/8” made from
3/32” flat head
steel rivet. 2 Reqd.
1/32” Cotter
Pin. 2 Reqd.
Dual Cable Attach Brackets
These brackets are used to attach the two sets of
flying wires and the elevator pull-pull cables to one
attach fitting. Six are included per package. Also
included are six 1/8” clevis pins and six 1/32” cotter pins.They are made from 3/16” 2024T-3 sheet
aluminum. 2024T-3 is very easy to cut on a standard wood cutting band saw. The flange portion is
easily cut on the band saw. Accuracy is not real
critical on this part. Our instructions and drawing
for this part explain in detail the making of this part.
1/32” Thick brass arms
2 Reqd.
1/32” dia. Clevis pin
(not visible). 2 Reqd.
Robart 4-40 steel
clevis. 2 Reqd.
1/8” dia. Aircraft
Clevis Pin. 2 Reqd.
Center unit from Dubro
turnbuckle
Note: The clevises are soldered to
the outside ends of the threaded
studs.
Scale-Like Turnbuckle Assembly
The turnbuckle assembly consists of one brass
center piece (Dubro turnbuckle) that has 4-40 right
and left hand threads, two steel Robart 4-40 clevises, one homemade 4-40 right and left hand coupler made from 1/8” dia brass or steel rod, and one
4-40 x 5/8” stud. 24 turnbuckle assemblies are
required.
The Robart clevises are soldered to the two studs
with Stay Brite Silver Solder. This is easily accomplished with a soldering iron. The right and left
hand threads going into the Dubro turnbuckle part
allows for the easy adjustment of the flying wires.
Thin copper or brass wire is used to lock the clevises in place.
Dual cable attach
bracket. 2 Reqd.
Arms soldered to shaft.
Bracket soldered to
brass tubing housing.
Nylon bushings
2 Reqd.
1/32” Thick
brass brackets.
2 Reqd.
1/8” dia. Brass rod
shaft.
Scale-Like Elevator Bellcrank Assy.
This includes two bellcrank arms, two special dual
turnbuckle attach brackets, two 1/8” dia. aircraft
clevis pins, nylon bushings, 1/8” dia. rod shaft, and
all necessary hardware items.
Rudder control horn
assy.
Right hand elevator control
horn assy.
1/4”
Left hand elevator control horn assy.
.27”
Aileron control horn
assy. 2 Reqd.
Scale-Like Control Horns
We have designed the flight control surface control
horns for our Fury II to be as scale as possible and
Page 11
still be easy to make. They are made from 1/16”
brass sheet and cut out with a standard band saw.
The various parts are then soldered together with
Stay Brite Silver Solder. They are available as a
complete set.
#1 x 1/4” Sheet metal screw
not realistic when looking inside the scale cockpit.
Our tie rod is made from 1/8” dia. welding rod and
threaded on each end with a 4-40 thread. A package of 6 are available.
Pheonolic bearings
each end.
Threaded end
.032” Brass bracket soldered to threaded rod
1” dia. 1/4” Thick control arm attach fitting.
2-56 Threaded rod
soldered into body
2-56 Threaded rod
bent 90 deg.
2-56 Miniature elastic stop
nut and washer. Typ. 2 plcs.
1/16” 2024T-3
Aluminum control
arms. Typ. 2 Plcs.
3/16” Square brass body
1/8” Dia.brass retaining fitting
1/32” Cotter pin
Scale-Like Hinges
The Fury II homebuilt uses several Tiger Moth
parts in its construction. One of the more common
items used are the hinges for all the flight control
surfaces. We have come pretty close to duplicating
the general look of these hinges.
The body of the hinge is made from 3/16” square
brass. It is easy to make with the aid of a couple of
simple wood jigs. Two holes have to be drilled in it
and one hole is tapped with a 4-40 thread. A simple brass bracket is made from 1/32” thick brass.
Soldering is required. Instructions and drawings
are provided for the user to make the hinges, but
they will also be made available ready to install. A
package of 13 with all hardware is available.
1/8” dia. Welding rod.
Tapped 4-40 thread
each end.
Scale-Like Fuselage Reinforcing Tie Rods
The scale fuselage wing and landing gear attach
points are metal fittings. These fittings are directly
connected to the right and left hand brackets. A
metal rod goes across the fuselage width and has
threaded ends with miniature 4-40 elastic stop nuts
that bolt the right and brackets against each other.
A full length 4-40 threaded rod would work, but it is
1/8” Dia. x 7/16” Steel
roll pins. 4 Reqd. Typ. 2
Plcs. (1 On each side.)
2-56 x 1/2” Machine
screws and elastic
stop nuts. Typ. 2
Plcs.
Rudder Pull-Pull Bellcrank Assembly.
The location of the rudder servo is very low in the
fuselage. For the rudder pull-pull cables to enter
the fuselage in a scale location a special pull-pull b
ellcrank is required. Our bellcrank is made with
parts that will never require maintenance. The control arms are 1/16” 2024T-3 Aluminum. They are
bolted to one inch diamter attach fittings that are
neld in position with 1/8” dia. roll pins. 2-56
machine screws are used with miniature elastic
stop nuts to hold the arms to the attach fitting. At
each end of the 3/8” dia. 6061T-6 aluminum shaft
are 1/4” dia pheonlic inserts 3/4” long that are the
bearings for the full length 1/8” dia. brass rod bearing shaft (not shown in the view). The 1/8” brass
rod is removable for the initial installation and for
future maintenance if necessary. A package with
all the parts for this assembly is avaiable. All the
items in the assembly can be made in a home
workshop without any special equipment other
than a band saw and a drill press.
1/16” Dia. x 1/8” Roll
Pin. 1 on each side.
2 Reqd.
Page 12
SCALE DOCUMENTATION
e will offer scale documentation for the subject Fury II aircraft. There will be a 3-View of
the original Fury I (with the inline engine) and the
Fury II and many photos of the subject aircraft that
are taken by the current owner of the subject aircraft. A few of these photos are shown here. The
photos will be available on-line. As with many
homebuilt aircraft, all of the full-scale Fury II’s that
have been built are somewhat different in many of
the small details such as in the landing gear and
wheels, cockpit details, as well as different paint
schemes. Almost all of them have a different kind
of cowling. A few have a inline engine of some sort.
W
Side view of aluminum cowl and
engine
exhaust
stacks.
There is very little photo documentation for the
original Fury I. There are many photos of the fullscale Fury II’s available on the internet search
engines (Goggle) by searching isaacs fury II. Also
there are some photos available from the Aircraft
Registry of England. Just enter Fury II for the type
of aircraft and there will be information on the owners and photos of several of the Fury II’s that are
registered in England. There are 14 Fury II’s registered in England and four or five in New Zealand.
There are a three or four registered in the USA, but
at this time we are not certain of the status of these
aircraft.
Throttle, mixture
and carburetor
heat levers.
Front view of landing gear and
carburetor air intake.
Shown is a close up of the front dual
flying wires attached the left side
bracket at the landing gear area.
N-Strut attach fitting bottom
right wing and landing wire
attachment
Page 13
COMMENTS OF NUMBER OF
PARTS USED
Our Fury II is not a difficult aircraft to build. All of
the individual components are very simple in
nature. What does make this model more time
consuming to build are the number of parts.
Our Fury II is built in a similar method with exception that the 1/32” plywood fuselage sheeting is not
installed until the entire aircraft is complete including the radio equipment with all of the linkage and
the engine is mounted. The 1/4” square spruce
front frame assembly and the aft frame assembly
are built separately. The 1/32” plywood sheeting is
not installed at this time. The two frames are glued
together without the sheeting. The fuselage brackets and fittings can be installed at this time.
Our Fury II duplicates the structure of the full-scale
Fury II. There are few minor exceptions, but overall, there are about as many parts in our 30% Fury
II as there are in full-scale Fury II’s. These parts in
The tail group, landing gear, cabine strut assembly,
most cases are simple parts such as 1/64” and
upper and lower
1/32” plywood
wings, and flygussets. There
ing wires can all
are many cross
be
installed.
braces in the
Since the fusewing and tail
lage sheeting is
group as well.
not in place, it is
Perhaps many
somewhat easy
are not required
to install the
to provide struccockpit interior
tural integrity for
parts (rudder
our model. But
bar,
control
don’t forget, we
stick, throttle,
Carb Heat
are doing our
seat, and the
Control
best to actually
rudder and eleduplicate
the
vator servo tray
structure in a
assemblies.
Mixture
very scale manControl
ner. And, there
When all of the
are a lot of small View of scale throttle assy. A pushrod is attached to it that operates
components
parts that make the ignition kill switch in the front of aircraft
are
installed
up the cockpit
and the control system is working properly, then all
details. Of course the cockpit items could be left
the sub assemblies are removed from the fuselage
out. But, these items add a lot of character to the
frame. Leave the radio equipment in place but
model.
remove the pull-pull cables which will be installed
when the side sheeting is in place. Then the sheetA comment here on the cockpit details is worth
ing is installed. After the sheeting is in place, the
mentioning. These items are somewhat easier to
model can be covered with fabric of the builder’s
install as compared to most scale models. This is
choosing. The aircraft’s individual sub assemblies
due to the method of the fuselage construction.
(wing, stab, etc.) can also be covered and painted
The full-scale Fury II’s fuselage is built in two secseparately at this time. Then the model can be
tions, from the cockpit forward and another from
reassembled and thereby completed.
the cockpit aft. They are built independently from
each other and then bolted together to form the
complete fuselage.
Page 14
PARTS AND MATERIALS USED
ll of the materials used in our Fury II are readily available from various sources. Many items
will not be available at your corner hobby shop
since many hobby shops no longer offer building
supplies. But all the parts used in the construction
are standard items stocked by several companies
around the USA. Aircraft Spruce. a homebuilt aircraft supplier, is one of the suppliers for our Fury II
materials. A list of suppliers for all the parts is provided. Many cases there are multiple suppliers for
various items.
A
The basic fuselage structure is 1/4” square spruce
used for the fuselage longerons and vertical supports. Spruce strips are also used to fabricate several of the bulkheads. 1/8” LitePly and 1/64”, 1/32”,
and 1/16” birch plywood is used for some of the
bulkheads. The sides and sheeting are 1/32” birch
plywood.
The wings have laminated spruce spars made
from various sizes of square spruce strips. The
wing ribs are from 1/8” LitePly. Some balsa is used
for fairing strips. Some 1/64” to 1/16” Birch plywood is used for doublers and gussets. 1/16” basswood strips are used to laminate the wing tips. The
leading edge is hard 3/8” square balsa which is
easier to shape than spruce.
with a fiberglass nose bowl. The cowl will be held
in place with unique nylon snap-in blind nuts for
either 2-56 or 4-40 screws.
Streamline flying wires are not used in The full-size
Fury II’s. It uses standard 1/8” diameter stainless
steel cable for the wing wires, cabine wires, landing gear cross braces, and the pull-pull linkage.
We use 1/32”x 19 stainless steel cable. Of note,
our Fury II like the full-size one, the flying and landing wires provide the only support to keep the wing
panels in position.
There are 24 turnbuckles used in our Fury II.They
are assembled using a Dubro turnbuckle body,
home-made hand attach studs with one having
both a 4-40 right and left hand thread, and two
Robert 4-40 clevises. Attachment to fittings will be
done with 3/32” dia. clevis pins made from 3/32”
flat head steel rivets.This combination of parts provides a strong scale-like turnbuckle.
POWER TOOLS REQUIRED
e assume that the builder has the necessary
skill or experience to build our Fury II. The
model is for advanced model builders and not first
time builder. To construct the model in a timely
manner, some power tools are required. We recommend the following power tools to fabricate the
necessary parts.
W
The tail group is also made from similar materials
as used in the wing panels.
Band Saw
Disc or Belt Sander
Drill Press
Dremel Tool
Dremel Jig Saw
1/4” Electric drill motor
Set of fractional and number drills
Bench Vise
The landing gear is made from 4130 steel tubing.
Design is somewhat simple in nature. Details on
the construction of it will help the builder. Several
ways of making the V-Strut portion are provided.
One would select the best method depending on
the equipment and somewhat of the metal working
skills of the builder.
The cowl is made from .016” aluminum sheet simply wrapped around to the shape indicated. The
nose bowl is made from a balsa wood block. We
are going to experiment with the making of a sheet
aluminum nose bowl. Also we may also come up
We also assume that the builder has necessary
hand tools and supplies common for the building of
model aircraft. Any special hand tools and other
items required will be mentioned and where to purchase them.
. . S C A L E B U I LT R / C • P O B o x 1 3 2 7 • K e l l e r , T X 7 6 2 4 4 - 1 3 2 7 U S A
Page 15
Over 30 years later this event is still active.
PRICE AND ORDERING
INFORMATION
rices for the 36” x 24” drawings and the laser
cut parts are not known at the time of this writing. We do not plan to make blue prints for our
drawings. Our drawings will be individually printed
on an ink jet plotter. As changes occur in the
design due to engineering changes or error corrections, each printed drawing will automatically be
up to date.
P
Probably the drawing set of 6-7 prints will have to
sell for least $100. There will be about 75 or so
individual 1/8” LitePly laser cut parts and the cost
of having them cut for us is unknown at this time.
The detailed instruction manual and the 8 1/2” X
11” drawings will be available on-line and are available at no charge.
The turn around pattern for R/C aerobatics was his
idea as well as the IMAC scale aerobatic competition category. The initial Tournament Of Champions
rules were also developed by Jerry and was the
contest director for many of the early competitions.
Over 30 years ago he produced the first all fiberglass R/C model, a 12 foot span KA6E sailplane.
Several years ago he designed and built three 100
inch fully aerobatic all aluminum R/C models. These
were the first fully aerobatic R/C models with a
structure entirely from aluminum. He has had extensive experience in the development of producing
unorthodox structures for R/C models.
1998 Jerry was elected to the AMA Hall of Fame for
his past accomplishments in his radio control modeling activities.
DESIGNER
BACKGROUND
ur Fury II biplane is designed by Jerry Nelson,
president and owner of Nelson Aircraft Co.
Jerry is an internationally known designer of R/C
models and has designed, drawn, and published
over 50 different R/C model aircraft from 1/2A R/C’s,
AMA/FAI pattern, pylon racers, sailplanes, scale aircraft, and several giant scale projects. He is a graduate of San Jose State University and has a degree
in aviation maintenance engineering. He has a FAA
airframe and powerplant license and a private pilot
license with an instrument and glider rating with flying time in excess of 800 hours.
O
Jerry has competed in model airplane contests for
over 50 years. Won his first trophy in U-Control stunt
at 12 years of age, and he was competing against
adults. First R/C contest win was rudder only at the
1956 AMA Nationals. Was a member of the winning
FAI USA aerobatic team at the Belgium FAI world
aerobatic championships in 1965.
Jerry has also been instrumental in the introduction
of new forms of R/C competitions. He developed the
closed course Goodyear style pylon racer event.
Page 16
3-View Drawing
3-View drawing printed with permission from Flying Scale
Magazine, Model Activity Press, England
3-View shown is for the basic exposed cylinder Fury II. Cowling different on most Fury II’s.
Page 17
Right Rear Side View
1/64” Plywood
sheeting leading
edge and bottom to
rear spar.
Ailerons top wing
only.
Laminated 1/16” bass wood
strip wing tips wrapped
around a 1/16” birch plywood inner tip.
1/32’ Plywood sides and
top sheeting.
Steel tubing shock absorbing
scale tail skid.
Entire tail group is bolted
to fuselage and can be
removed.
Left Rear View
.016” Aluminum
fixed rudder
tab..
1/16” Plywood trim tab.
works from cockpit.
Page 18
Fuselage Internal & Cockpit Details
Spruce N struts.
Removable aluminum gap
Baggage
door hinges covers. Typical 4 places.
Removable plywood instruopen to get
ment panel to get to batteries.
to receiver.
Aluminum cockpit door opens
flush with side.
Radio batteries mount on
plywood
floor.
Elevator pulll-pull
bellcrank assy.
Receiver (s) mounts on
plywood floor.
Removable seat made
from aluminum, fiberglass, or plywood.
Seat belt bracket.
One each side.
Rudder pulll-pull bellcrank
assembly.
1/8” LitePly ribs and 1/16”
plywood trailing edge. Typical
both wings.
Rudder servo mounted on
aluminum tray.
Control Stick Details
Typical aluminum
attachment washer
plate. Inside plates
painted black.
Scale engine controls.
Throttle lever operates
ignition on-off switch.
Mixture control operates
engine’s choke.
Rudder tiller bar
assembly.
Control stick. Rubber
tubing handle also
on rudder bar.Moves
with elevator servos.
.016” Aluminum pads for
pilot’s foot rest.
Control stick unit
attaches to 1/8”
LitePly assembly.
Control stick moves by
pushrod attached to elevator
pull-pull bellcrank. (Note
minor error in attach point of
ball link to be corrected)
Non functional scale
aileron control cable
assembly representation.
Page 19
Cowl, Landing Gear, & Fuselage Interior Details
1/32” dia. Cable
Balsa block, sheet landing and flying
aluminum, or fiber- wires with turnbuckglass nose bowl.
les.
1/32” Cable with turnbuckles
cabine strut bracing. 4 Reqd.
.016” Aluminum
sheet removable
covers. Typ. 2 plcs.
4 1/4” Needle
nose aluminum
spinner.
.016” Aluminum
Balsawood streamline fairing
strips. Typical 6 plcs.
4-40 Bolts and miniature elastic
stop nuts attach landing gear struts
air scoop.
.016 aluminum sheet
cowl. Removable to get
access to engine.
1/32” Cable with turnbckles.
and clevises/clevis pins. 2
Reqd.
3/16” dia. 4130 Steel tubing cross rods. 2 Reqd.
3/8” dia. 4130 Steel tubing axle
1/8” dia. Bungee shock cord wrapped around
axle and cross rods. (not shown) Typ. 2 plcs.
5/16” 4130 tubing Steel tubing
landing gear V Strut. 2 Reqd.
Spruce streamline shape. CA
glue and wrap with fabric pinking tape. 2 Reqd.
7” Vintage style wheels from
William Bros and Dubro.Mfg.
Possible spoked wheels from
England.
Venturi Tube
Venturi Tube
A Venturi Tube is a vacuum source for operating some aircraft instruments that would normally be electrically driven.
(Not shown in illustration above.)
Page 20
Front Fuselage Frame Details
STEP ONE OF FUSELAGE FRAME
ASSEMBLY
Rear Fuselage Frame Details
STEP TWO OF FUSELAGE FRAME
ASSEMBLY
Page 21
Joined Fuselage Frame Details
FINAL STEP OF FUSELAGE FRAME
ASSEMBLY
Front Fuselage Frame With Additional Details
Page 22
Front Fuselage Assembly
Custom scale-like
turnbuckles. 24 Reqd.
Balsawood fairing
strips on cabine
struts.
1/32” dia.
Cable cabine
strut braces.
Firewall made from
e pieces of 1/8”
LitePly and 1/16”
birch plywood on
either side.
3/8” Piano
hinge for
cockpit door.
Removable
seat.
3/16” 2024T3 Aluminum
mounting ring
Seat belt attach
bracket.
NOTE:
1/32” Plywood sheeting is omitted in this
illustration.
2 Pieces of 1/8”
Motor mount box made
LitePly gap cover from 1/8” LitePly and
support.
1/16” birch plywood doublers. Adjust length to fit
length of engine.
3/16” Socket
head mounting bolts.
.025” 2024T-3
Aluminum
brackets.
Gas Tank Installation
24 Ounce
Sullivan or
Dubro Gas Tank
Page 23
Rear Fuselage Assembly
Spring
Pivot
Point
5/16” Steel
Tubing
Shoe is
replaceable
Tail Skid Installation
The full-scale design of the Fury II fuselage is very unique. There is a front section and a rear section.
These two assemblies are simply bolted together with metal brackets attached to the fuselage longerons
and supports. Our 30% scale Fury II is made in basically the same manner.
Shown is the rear section without the 1/32” plywood sheeting. All of the internal structure and the various
assemblies are installed. The rudder servo tray is also installed. This completed assembly is then glued to
the front section which has been also constructed in a similar manner. At this time the 1/32” plywood sheeting for both the front and rear sections still has not been attached. After the aircraft has been completely
assembled including cockpit details, engine, R/C equipment, and flying wires, then the major components
(wing, stab, ect.) are unbolted and removed from the assembly. The brackets are removed and then the
1/32” plywood sheeting is installed. After the side sheeting has been attached, then the brackets are reinstalled.
The basic structure has 1/4” square spruce longerons and spruce supports. The various brackets for
attaching the tail group and tail skid are made from .025” 2024T-3 aluminum and bolted to the structure is
2-56 screws and a few 4-40 screws all using miniature elastic stop nuts.
Page 24
Stabilizer Attach & Tail Skid Assy.
Two main items are shown here, the stabilizer attachment to the fuselage and the installation of the tail
skid. The stabilizer is attached to four .025” thick aluminum brackets bolted to the outside of the fuselage.
Two sets of 2-56 screws with miniature elastic stop nuts are used to securely attach the stabilizer. The stabilizer has 2 degrees of incidence that is obtained by two spruce spacer blocks. The incidence can be
changed with modified spacer blocks. If the incidence is changed, new 1/8” diameter brass front struts will
have to be made.
The tail skid assembly is very close to scale. The main shaft is 5/16” steel tubing. Two .025” thick stabilizer strut/tail skid pivot brackets are bolted to the sides of the fuselage. A LitePly bulkhead provides additional support for side loads and also as a stop for up and down movement of the tail skid. There is a steel
or aluminum shoe that is attached to the tail skid shaft. The shoe can be replaced easily if it should wear
down too much. A spring provides the shock action. With some difficulty, the tail skid can be removed from
the fuselage assembly for service if necessary.
Note the scale aluminum rudder trim tab and the plywood elevator trim tab. At this time the linkage to the
trim tab has not been installed. The trim tab can actually be moved from the cockpit. A flexible cable
enclosed in a plastic tube operates the trim tab. In the subject Fury II, the trim tab was added after the aircraft was built. The rudder trim tab is bent slightly to the left. This is to compensate for the left turn torque
effect caused by the engine and prop at full throttle.
Page 25
Vertical Fin and Rudder Assembly
The Fin and Rudder assemblies are built similar to each other. Spars are made from 3/16”
and 1/4” thick spruce. Ribs are 1/8” LitePly. Leading edge and trailing edge braces are 1/16”
plywood. This type of construction is not scale, but when the assemblies are covered with
fabric, they will look very close to the full-scale construction. Fin’s spar is bolted to the rear
portion of the fuselage with two screws. A metal bracket is attached to the bulkhead just
ahead of the fin’s leading edge. This bracket goes on each side of the base of the leading
edge of the fin. A 2-56 screw attaches the fin to the bracket. A aluminum trim tab is bolted
to the rudder. It is bent slightly to the left thus duplicating the subject aircraft’s trim tab.
Hinge Detail (Used in all flight control surfaces.)
#1 Sheet metal screw
Threaded end
.032” Brass bracket soldered to threaded rod
2-56 Threaded rod
soldered into body
2-56 Threaded rod
bent 90 deg.
2-56 Miniature elastic
stop nut and washer
View of the middle rudder hinge.
3/16” Square brass body
1/8” Dia.brass retaining fitting
1/32” Cotter pin
The scale hinge assembly is used for all the control surface hinging. The body of the hinge is 3/16” square brass. The
attachment shafts are made from Dubro 2-56 threaded rods. The bracket is from 1/32” brass sheet. The retaining fitting is 1/8” diameter brass. The upper threaded rod is bent to a 90 degree angle. The left threaded rod is threaded
into the body and then soldered. A hole is then drilled through the body. A 1/32” cotter pin keeps the retaining fitting in
position.
Page 26
Stabilizer and Elevator Assembly
The stabilizer and elevators are built in a similar way to the vertical fin and rudder. All the construction
materials are the same with the exception of the 1/4” balsa leading edge and the 1/16” balsa leading edge
sheeting. Tips are laminated 1/16” bass sheet attached to a 1/16” birch plywood inner tip. Trailing edge
is 1/16” birch plywood. Cap strips and gussets are from 1/64” birch plywood. Stabilizer is attached to fuselage bracket with 2-56 screws and nuts.
Trim Tab Assembly (bottom view)
Trim Tab Hinge
Typ. 2 Plcs.
Aluminum Trim
Tab Control
Horn
1/16” Plywood
Trim Tab
Page 27
Wing Center Section
Full depth 1/4”
spruce spars.
1/64” Birch plywood
sheeting top and
bottom.
Trailing edge 1/16
birch plywood
1/16” 7075T-6
Aluminum spar fittings.
1/8” LitePly ribs
NOTE: This assembly is not completely
finished. Work In Process.
Lower Right Wing (top view)
1/8” x 1/4” Spruce
Braces.
1/16” Plywood
Wing Tip Brace
1/64” PLywood
Gussets.
Pitot Tube (lower left wing)
3/8” Sq. Hard
Balsa Leading
Edge.
NOTE: Wing tip is made from 4
pcs. of 1/16 x 5/16” Bass-wood
strips individually glued to wing
tip brace.
1/4” Full Depth
Spruce Spars.
1/16” 7075T-6
Aluminum Spar
Attach Fittings.
1/16” Plywood
Trailing Edge.
1/8” LitePly Ribs.
Tie Down Ring (wing bottom)
Page 28
Upper Right Wing (top view)
1/16” 7075T-6
Aluminum
Fittings.
Standard Size 125 in.oz Aileron
Servo mounted on Aluminum
Servo Tray.
Aluminum
Brackets.
Ribs 1/8” LitePly.
Bottom view without servo cover.
Wing Tip 1/16” x
5/16” Bass Strips
Male Hinge Assembly.
Typ. 3 Plcs.
Aileron
Pushrod
Aluminum Servo
Cover.
1/8” x 1/4” Spruce
Cross Braces
Bottom view with servo cover.
1/64” Plywood
Gussets
Upper and lower wing panels are built in a similar manner. Upper wing has the ailerons. Construction is
similar to the full-scale Fury II. Wing spars are spruce and are full depth. Ribs (not scale construction) are
from 1/8” LitePly. Leading edge is 3/8” sq. hard balsa. Trailing edge is 1/16” birch plywood. Cross members are 1/8” x 1/4” spruce. Wing tips are 1/16” laminated bass wood. Spar fittings 1/16” 7075T-6aluminum.
Aileron (right wing)
Female Hinge
Assembly.
Typ. 3 Plcs.
Full Depth Spruce
Spar.
1/16” x 1/4” Balsa
Fairing Strips.
1/64” Plywood
Gussets.
Aileron Control
Horn.
1/16” Plywood
Trailing Edge.
NOTE: Wing is built with the aileron as part
of the main structure. Then the aileron is cut
out from the wing. This assures for perfect
alignment of the aileron.
Page 29

Isaacs Fury II

Transcription

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