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Composite-ARF Yak-55 SP (2.6m span)
both sides. This is the perfect throw for nice
and crisp snaps. If you like you can add about
20% exponential to the low rate setting as
well.
Rudder
Set the high rate to maximum throw both
sides, and at low rate reduced to about
125mm.
Add about
smooth tracking corrections. At the same time
you should remember that the Yak rudder is
very sensitive, and the plane will shake at
high speed if the rudder linkage is not really
rock solid. So check your linkages and
closed-loop cables again and make sure that there is NO
slop at all ! On the other hand these characteristics are
also the reason for best rudder sensitivity at the slowest
3D-speeds.
Ailerons
Set the high rate to maximum throw both sides, and use at
least 30% exponential at high rate. For low rate you should
decrease the throw to the TOP to 40mm, to the BOTTOM
to 45mm. Yes, you're right - this is a reversed differential
due to the hinge line being in the top skin instead of on the
centre line. You will have to finalise this differential figure
during flight, as mentioned earlier. At high rate, for 3D
maneouvres, this doesn't affect the rolling too much, so you
can maximize the throws to whatever is mechanically pos-
sible, even more up than down if you wish. You may need
to lengthen the slots in the servo hatches by 2mm or so at
the front to obtain the maximum high
rate throws.
In General
Your Yak has very large control sur-
faces. This makes it very sensitive and
reactive. It is always possible that these
huge control surfaces can flutter at high
speeds if the assembly, servo installa-
tion and linkages are not made perfect-
ly. The design is so strong that even flut-
ter will not damage the structure of the
plane. But if a servo gear strips, the flut-
ter will not stop until the plane slows
down (or hits the ground...)
So please do yourself a favour, and make sure that you only use the best servos available, and
take the utmost care making your linkages. Check every linkage for slop, and rather reduce the
maximum throw than risking a high speed flutter due to sloppy servo gear or linkages. To pre-
vent this for sure, we recommend reduced control travels (reduced by using short servo arms,
not by using electronic settings). Using 2 servos per control surface as described in this manu-
al will never overload or damage high quality servos, even if the maximum travel of each servo
25% exponential for
techsupport@composite-arf.com
RUDDER THROWS
High-Rate throws shown
High-Rate throws shown
AILERON THROWS
36
high rate: maximum
low rate: 125mm
low rate: 125mm
high rate: maximum
high rate: maximum
low rate: 40mm up
low rate: 45mm down
high rate: maximum
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