L-39 Albatros 68mm EDF

L-39 Albatros 68mm EDF
High performance Fiberglass L39 for 68mm electric ducted fan
Specification
• Flying Weight
1,100-1,200 g
• Wing span
810mm.
• Length
900mm.
• EDF Rotor diameter
68mm
Specifications are subject to change without notice
Warning !
This model is not a toy and please read the manual carefully before construction and
operating this model aircraft.
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Equipment and parts needed
Radio system for 4 channels or above
1x 40- 60A Electronic speed controllers for brushless motor
1x 70mm fan-units
1x 500-700W 3600-4400kv brushless motors
4x Servo extension wires
3x 9g mini servo
Lithium polymer 3-4 cell, 2200-3200mAh, 20-45c
5 or 30 minute epoxy, CA Glue
Velcro.
Locktite/ threadlock
Tools needed
Drill , drill bit 2mm, 3mm, 5mm
Plier/cutter/ Philip screw driver
2mm , 3mm hex driver
Scissor
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Inside the Box
Fuselage, Main wing, Fuel Tank, Exit ducting sheet, elevator , EDF cover, wing joiner, landing
gear and wheel, canopy, hardware bags ( screw, horn, linkage connector, M3 nut, steering
arm, 3mm collar, mounting plate, magnet).
Aileron Servo
Find a pre-cut slot at the underside of the wing and cut open the film. Insert the aileron servo
and pass the wire through the hole. You may use servo extension wire. The ailerons have
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been attached to the wing in factory. Before gluing the aileron servo, center the servo horn
by means of a servo tester or with a receiver/ transmitter. Install the servo with epoxy and
balsa wood block if necessary. Mark the horn insertion and cut a 5mm slot in the aileron and
epoxy the control horn. Connect the linkage wire to the servo horn.
Main Wing
Try fitting the wings to the fuselage with the wing joiner and the 3mm carbon rod. Adjust and
orient the joiner such that both wings are in perfect position. 5mm holes can be drilled on the
sides of the fuselage to pass the wires of the aileron servos. Drill two 3mm holes on the
fuselage to connect the carbon rods, that strengthen the wing against torsion.
The wing joiner is made of fiberglass and this guarantee no risk of wing breakage at high
velocity. Sand all contact surfaces to maximize bonding strength.
Main Wing
Glue the main wings with epoxy, then tape the wings firmly to the fuselage. Support the wing
with blocks if necessary. Check for horizontal and longitudinal symmetry.
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Fuel Tank
Sand away the paint on the fuel tank attachment area. Use 5 mins epoxy to attach the tank to
the main wing. Use clamps/ tape to secure the position.
Elevator
Detach the aileron from the horizontal plate. Bent the U-shaped wire with a collar fir inside.
Pass the U-shaped wire through the slot on the fuselage. Drill a 2mmx10mm hole in the
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aileron and try inserting the wire into the hole. Apply CA/ epoxy to attach the elevator to the
horizontal plate after they are in perfect position. Finally, the most important, is to applied
30mins epoxy to secure the horizontal plate to the fuselage. Make sure the horizontal
stabilizer is clamped/ taped such that it lies in the same horizontal plane with the wing.
Ensure it is also perpendicular to the vertical stabilizer. You may use tape to run across the
vertical stabilizer to avoid any position change before the epoxy cured.
Elevator Linkage
The above diagram is for illustration only.
The hex nut under the elevator collar can now be loctited with the push horn in position.
Connect the linkage wire with the linkage connector given.
Exit Ducting
Cut the exit duct cone and try fitting the EDF unit. The recommended length is 8cm with exit
area equals 85% of fan sweep area. Recommended exit diameter is 55-58 mm.
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Ducted Fan Unit
Test run the EDF unit before installation. Check and mark the ESC connector to ensure air is
blown backward.
Try inserting the EDF unit with the backend first. Apply glue/tape to both end of the EDF
housing. Make perfect sealing to enhance the EDF efficiency. Assemble the ducted fan unit
and anchor the ESC.
EDF cover
Use transparent tape to attach the light EDF cover.
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Cockpit
The pre-painted and pre-assembled canopy and cockpit can be a snap on.
Control Throws
The neutral position of the elevator should be the same horizontal level with main wing.
The above photo shows the down elevator stick/ pitch up at low rate.
Elevator throw is 8 mm up 8mm down. Use 50% exponential. Low rate 6mm.
Ailerons throw is 8 mm up 6 mm down. Use 30% exponential. Low rate 5mm.
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Main Landing gear
Main landing gear assembly. This is a versatile design that can suits all options, including
pilots looking for belly landing, fixed gears or optional electronic retractable gears.
The factory assembled landing gear unit can adapt fixed landing gear. Insert the piano wire
and fixed the position with the provided nylon slab and screw.
Apply sufficient epoxy to make the block strongly attached to the fuselage. Attach the Landing
gears as above.
On the other hand, one can simple install an electronic retractable gear as an option.
Front Landing gear
Assemble the front gear mount as shown. Apply sufficient epoxy to make the mount strong.
The wooden mount allows use to upgrade to optional electronic retractable gear.
Tighten the steering control arm. Connect the linkage connector to the steering servo (Rudder
Channel)
The height of the front gear is adjusted by the 3mm at the bottom. This is critical for runway
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take off. The Wing incidence, the attack angle of the main wing to the runway path, will be one
of the factors for the take off distance. It should be slightly positive when the aircraft is loaded
with battery.
Optional Electronic retract
The fuselage wheel space is pre-cut in factory. You need to extend the space for the strut as
shown in the diagram above. The ChangeSun electronic retract can be drop fit into the precut
space. You can use Y-cable to connect all 3 electronic retracts. Set the ATV of the
corresponding channel (Gear Ch.) to maximum in both direction.
Optional Electronic retract
The fuselage wheel space is pre-cut in factory. You need to extend the space for the strut as
shown in the diagram above. The ChangeSun electronic retract can be drop fit into the precut
space. You can use Y-cable to connect all 3 electronic retracts. Set the ATV of the
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corresponding channel (Gear Ch.) to maximum in both direction.
Optional Electronic retract
The nose gear slot is pre-cut in factory. The ChangeSun electronic retract can be installed with
ease. You may need some balsa wood to secure the steering servo in place.
C.G. setting
The idea C.G. position is 6 cm behind the leading edge measured at where the wing meets
the fuselage. Adjust the battery position to obtain the correct C.G. Check the C.G. before flying.
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Warning for pilot
Assistance from experienced pilot is necessary for beginners.
Pre-flight adjustment and trimming must be done before flying. Check all
linkage, nuts, servo horns, linkage nuts and screws are tightened. Make sure
thread lockers are applied.
Ensure the flying field is spacious and safe to fly.
Bench test the electronic equipment on loading for 5minutes. Check
temperature of the ESC, BEC and battery. This is to ensure the power
system and the BEC are reliable. All EDF should be run in to test for
vibrations and loosen shaft.
Check all electronic equipment. Range check the radio equipment. Test all
control surface are move in the assigned direction.
Check battery voltage before use, even the battery are recently charged.
At the first flight, it is prudent to check the C.G.
In runway takeoff, slight finger pressure at the trailing edge of the elevator
should be able to pitch up the aircraft.
Enjoy!
Take pictures and video of your scale looking,
high performance ProDesign fighter!
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