Advertisement
Composite-ARF Yak 55 (2.1m/83")
Elevator
Low rate should be no more than 30mm
(1.25") 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.
On high rate the elevator should be close to
the maximum available, up to 45 degrees both
sides, but in this case with at least 50% expo-
nential, and this hi-rate setting is definitely for
3D only !
Rudder
Set the high rate to maximum throw (about
150mm) both sides, and at low rate reduced to
about 80mm. The Yak needs quite a lot of rud-
der for nice stall turns, so you should at least
add 25% exponential for smooth tracking cor-
rections.
At the same time you should remember that
the Yak rudder is very sensitive, and the plane
starts shaking at high speed if the rudder link-
age is not really rock solid, so check your
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
Aileron throw for high rate is 55mm up
and down. Use at least 30% exponen-
tial for high rate. For low rate you
should decrease the throw to the top
to 35mm, and the bottom to 38mm.
Yes, 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 in
this instruction book. At high rate, for
3D manoeuvres, this doesn't effect
the rolling too much, so you can max-
imize the throws to whatever is
mechanically possible, even more up
than down if you wish.
In General
Your Yak 55SP has very large control surfaces, which makes it very sensitive and reactive. It is
always possible that these huge control surfaces can flutter at high speeds if the assembly, servo
installation and linkages are not made perfectly. So please do yourself a favour, and make sure
techsupport@composite-arf.com
ELEVATOR THROWS
RUDDER THROWS
AILERON THROWS
31
high rate: 60mm
low rate: 30mm
low rate: 30mm
high rate: 60mm
high rate: 150mm (max.)
low rate: 80mm
low rate: 80mm
high rate: 150mm (max.)
high rate: 55mm up
low rate: 35mm up
low rate: 38mm down
high rate: 55mm down
Advertisement
