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Composite-ARF YAK 55SP (3m span)
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Are the swages crimped up nice and tight on the rudder cables?
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For added security add one small drop of loctite/thread locking compound on all the bolts
that hold the servo arms to the servos, especially important with digital types.
Then you can go on set up all the linkages, control throws and R/C system as described below.
Centre of Gravity:
Set the Centre of Gravity to 190 - 200mm
(7.5 - 7.9"") forwards from the TRAILING
edge at the wingtip for the 1st flights. Hold it
with a helper at both wing tips in this posi-
tion and make sure the plane balances hor-
izontally. This is the 'pattern' CG position.
Don't forget to balance the plane laterally,
holding the spinner central bolt and a finger-
tip under the rudder and, if necessary, add
a small weight to the light wing tip to make
it track correctly.
Engine Thrustline:
Initially downthrust should initially be set at
0.5° degrees and right thrust 1.5 degrees, depending on
the prop used. We recommend a carbon 2-blade 30 x12 or
a 32 x 10 on a 150cc motor. It is a very quiet and powerful
solution. They are normally CNC-designed, so the prop is
balanced perfectly statically, dynamically and aerodynami-
cally, which keeps the vibration down to a minimum.
Control Throws:
All measurements are at the root/trailing edge position. All
controls should be set with a dual rate switch.
Setting Up Your Aircraft
techsupport@composite-arf.com
C of G range:
from Trailing Edge at Wing Tip.
CENTRE of GRAVITY
1 - 1.5° right-thrust, and 0.5° down-
thrust, depending on propeller
31
190 - 200 mm
THRUSTLINES
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