racing elite - Chicago Marine Electronics

RACING ELITE
The Olympic race course
Marine racing compass 103RE, 103PE and
103PE Tornado
2
Windward mark
°
45°
How to sail in wind shifts with RACING ELITE
The most important use of the racing compass is for finding the right
times to tack in the wind shifts on the windward legs of the race. The
typical wind shift situations are described here. To become a successful
racing sailor, you should be thoroughly acquainted with these principles.
FINISH
2.1
Starboard reach
Wind direction
Windward leg
Reaching
mark
90°
°
Oscillating shifts
The wind direction sometimes oscillates about an approximate mean
value. While sailing upwind, these shifts seem to occur more frequently
to a fast boat. When sailing in such oscillating shifts, you should always
tack in order to be on the lifting tack. This will give you the straightest
possible course towards the windward mark.
If the wind veers, tack to starboard to let the wind come in from that side.
If the wind backs (swings to the left), you should let it come in from the
left by tacking to port.
Tack:
Wind direction
degrees
Starboard
Port
Wind
000°
45°
345°
30°
Port reach
°
103RE
Introduction
Thank you for choosing a Racing Elite compass. Racing Elite is a series
of high quality compasses for sail racing including the unique offset
racing scale. Also cruisers who want to read the course from the rail will
enjoy these compasses with their very clear scale, stable card and
simplicity of use.
The compass card has 3 scales with 3 lubberlines:
1. Top scale 360°, read against the back central lubber line on
downwind.
2. Starbord green 360° edge scale, offset 40° anti clockwise from top
scale, read against starbord lubber line on starboard tack.
3. Port red 360° edge scale, which is offset 40° clockwise from top
scale, read against port lubber line or port tack.
45°
°
Leeward mark
°
Figure 1
This makes it possible to read the course
from 3 positions in the boat!
Memory arrows:
The green starboard arrow and red port arrow on the compass housing,
are to remind you to tack from starboard bow if the course
315°
Starborad
Wind direction
Port
015°
330°
000°
315°
45°
215°
Rule of thumb: As reading goes above mean: Tack to port.
S
As it goes below mean: Tack to starboard.
45°
Finish
345°
reach
reach
tacking
tacking
Run
The two front lubber lines are also offset 40°, from the central lubber line.
The offset edge scales and front lubber
lines, allows the helmsman to read the
course from the normal position in the boat,
on the rail usually slightly aft and to the
windward side of the compass.
000°
START
°
This is how the Olympic course is usually sailed:
tacking
Port
Figure 4
B
1
If the wind oscillates between 200 and 230 degrees, tack as the wind
goes past 215 degrees. The corresponding reading on the scale is 180°
on starboard and 230° on port tack. If you tack as soon as the wind
starts to swing back from the extremes, you will find yourself headed on
the first part of the new tack. So small shifts that do not pass the mean
value shouldn’t be tacked on. It is the average wind direction for the
whole leg that counts.
190° 200° 210° 220° 230° 240°
Finish
beat
reach
reach
Start
Figure 2
RACING ELITE gives you that winning advantage to use
the wind shifts to your best advantage!
30°
B
000°
315°
Figure 3
In figure 3, the boat in the example has a tacking angle of 90° and the
average wind direction is supposed to be 000°. The boat starts by
beating on port tack and is gradually lifted by the backing wind. But then
the wind starts to veer and eventually passes the average wind direction.
Believing that the wind will continue to veer, the helmsman tacks to
starboard as the average wind direction is passed. He then is lifted up to
15° by the veering wind. Here the wind starts to back again. When
passing the average wind direction, the helmsman tacks to port. He is
then lifted on port tack until he reads 30°, he is then lifted 15°. Then the
wind starts to veer again.
However, small shifts that do
pass the mean wind direction
shouldn’t be neglected
although they might be
difficult to see. The difference
between being headed or
lifted while beating is almost
one metre per degree wind
shift, per knot and minute
sailed. This means that going
the wrong way in a five
degree shift while sailing at 5
knots for one minute would
bring you almost 20 metres
behind a boat that went the
right way. It isn’t easy to
make up for such losses
by trying to sail faster.
A
B
215°
2
3
200°
200°
Figure 5
215°
Boat A tacks right, boat
B tacks wrong!
decreases, and tack from port bow if the course increases.
1
230°
230°
4
2.2
3
Permanent shifts
The wind sometimes shifts without returning to its original direction, at
least not for the remainder of the windward leg.
In this example, the wind is
first oscillating at about 200
degrees. A permanent shift
makes it veer to 240 degrees
and here the oscillations
continue. Tactically, the
oscillations could be
neglected in a case like this.
Changing tacks should only
be considered when the wind
direction goes past its mean
value for the whole windward
leg.
90°
100°
110°
120°
Starboard
Port
140°
09
103RE (Art. No. 36303-0801): For horizontal mounting. Designed for
mount on dinghies like the Laser below the mast, and therefore has a
hole for the cunningham or downhauls.
Wind direction
0930
103PE (Art. No. 36305-0801): For vertical mounting on bulkhead or on
mast.
Sea breeze coming
103PE Tornado (Art. No. 36355-0801): To be mounted vertically and
perpendicular to the boat to be read on both sides of the capsule. Only
two lubber lines. Supplied with two fronts.
1000
Clouds
1030
Mean value
Figure 6
Clouds
It is often difficult to predict
permanent shifts. Sometimes they are caused by ”wind bends” over the
coast line or by channelling between islands. They could also be caused
by clouds, the sea breeze coming in or appear for other, totally
unpredictable reasons. Shifts caused by topography should be sorted
out from those within the wind so that you can anticipate what will
happen on the next windward leg.
Sail into the new wind when there is a
permanent shift. If the wind veers, tack to
port. You will be more and more headed.
Then tack slightly before arriving at the lay
line. Now the veering wind will lift you up to
the mark (Boat A). Tacking the opposite
way does not pay off since you would loose
more while being headed on the second
tack than you could win by being lifted on
the first (Boat B).
A
240°
Mounting
All models are supplied with screws, mounting mouldings and templates
for mounting where needed.
00
190° 200° 210° 220° 230° 240°
Wind direction
130°
00
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Figure 8
Other racing compasses have to be adjusted before the start to set the
estimated mean wind direction. This can be difficult and as soon as this
direction changes any substantial amount the compass needs
readjustment. It is an advantage if the variations of the wind direction
can be followed directly and conveniently while sailing. This gives a
better idea of how the wind is shifting and permits continuos
reappraisal of the mean wind direction.
B
4
Accessories
All above models have optional mounting brackets. These are helpful if
you do not want to drill holes in your boat. Further with the brackets you
can more easily demount to avoid theft.
Art. No.
69996
69993
32535
34482
34479
34472
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Description
Mast bracket MC in aluminium for 103PE
Mast bracket Tornado for 103PE Tornado
Mounting mouldings for 103RE
Illumination 12V with visor for 103PE
Illumination 12V ”stick on” for all models
Compensator for all above models
Compensation
If the deviation is more than 5°, compensation is recommended. For the
compensation procedure, see the instructions supplied with the optional
compensator.
Since magnetic conditions in a boat are liable to change, we recommend
checking the compass once a year, and always after installation of
equipment which might affect the compass.
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Figure 7
Specifications
Capsule dimension:
Outer Dimensions:
Weight:
100 mm (4”)
See drawing of each model
103PE 600 g (21.2 oz)
103RE 730 g (25.7 oz)
103PE Tornado 620 g (21.9 oz)
Top scale every 5 ° marked
Edge scales every 10° marked.
Max. 30°
Operation: -10° to 70° C (14° to 158° F)
Storage:
-30° to 80° C (-22° to 176° F)
200°
Charts of wind shifts made by sailing meteorologists during races show
that the wind directions often change in very complex patterns.
Oscillations are added to shifts caused by the coast line, clouds or the
tendency of the sea breeze to veer with the sun during the day.
Graduation:
Heeling angle:
Temperature range:
103PE Tornado
128
150
40
100
93
132
103PE
5
6
115
7
Maintenance
To clean the compass use mild soap solution only and a soft cloth.
Do not use strong solvents, which may damage the plastic.
When not in use we recommend that you demount the compass and
store it in room temperature.
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Warranty
GENERAL
All our products are designed and built to comply to the highest class industry standards. If the
products are correctly installed, maintained and operated, as described in the installation and
operation manual, they will provide long and reliable service. Our international Network of
distributors can provide you with the information and assistance you may require virtually
anywhere in the world.
LIMITED WARRANTY
The warranty covers repair of defective parts due to faulty Manufacturing and includes labour
when repaired in the country of purchase. The warranty period is 5 years, and commences from
the date of purchase. The above warranty is the Manufacturer’s only warranty and no other
terms, expressed or implied, will apply. The Manufacturer specifically excludes the implied
warranty of merchantability and fitness for a particular purpose.
CONDITIONS
•
The receipt with proof of purchase date, must be shown to validate any warranty claim.
Claims are to be made in accordance with the claims procedure outlined below.
•
The warranty is non-transferrable and extends only to the original purchaser.
•
The warranty does not apply faulty installation or to conditions resulting from improper use,
external causes, including service or modifications not performed by the Manufacturer or by
its national distributors, or operation outside the environmental parameters specified for the
Product.
•
The Manufacturer will not compensate for consequential damage caused directly or
indirectly by the malfunction of its equipment. The Manufacturer is not liable for any
personal damage caused as a consequence of using its equipment.
•
The Manufacturer, its national distributors or dealers are not liable for charges arising from
sea trials, installation surveys or visits to the boat to attend to the equipment, whether
under warranty or not. The right is reserved to charge for such services at an appropriate
rate.
•
The Manufacturer reserves the right to replace any products returned for repair, within the
warranty period, with the nearest equivalent, if repair within a reasonable time period should
not be possible.
•
The terms and conditions of the warranty as described do not affect your statutory rights.
CLAIMS PROCEDURE
Equipment should be returned to the national distributor, or one of its appointed dealers, in the
country where it was originally purchased. Valid claims will then be serviced and returned to the
sender free of charge.
Alternatively, if the equipment is being used away from the country of purchase, it may be
returned to the national distributor, or one of its appointed dealers, in the country where it is being
used. In this case valid claims will cover parts only. Labour and return postage will be invoiced to
the sender at an appropriate rate.
DISCLAIMER
Common sense must be used at all times when navigating and the Manufacturer’s navigation
equipment should only be considered as aids to navigation.
The Manufacturers policy of continuous improvement may result in changes to product
specification without prior notice.
Copyright © and Manufucturer:
Silva Sweden AB
Kuskvägen 4, 191 62 Sollentuna, Sweden
Tel: +46-(0)8 623 43 00. Fax+46-(0)8 92 76 01
www.silva.se
Edition: September 1998
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