CG:
The CG is widely changeable. Measured from the leading edge, just where it begins to go staight
(outside of the filled):
270 - 350 mm
60 mm are adjustable by choosing either the front or the back mounting position. Another 20 mm
are variable due to battery and other hardware components placing.
Control throws:
Our first three prototype planes were used to determine the best throws. We found out, that
basically the plane can be set up with ONE CG only, and with either high or low rates. We think
that it is not necessary to add a third rate setting for snapping. This makes the programming very
easy, and while flying it will let you concentrate on performing the manouvers instead of addi-
tionally kicking switches all the time.
Travel Setting Table:
Low Rate
High Rate
up / down
up / down
Aileron
75
90
110
130
(at root)
Rudder
135
135
160
160
(counter blalance L.E.)
Elevator
60
60
150
150
(couter balance L.E.)
Incindences:
We determined the wing to be 0.4 - 0.5 deg positive and the stab to be 0.2 deg negative. this can
be achieved by setting the rear wing dowel to approx. the center of the slot, and the front pin of
the stab approx. 1 - 1.5 mm down.
Thrust:
The Yak-55SP needs remarkably low amount of side thrust, 1.5 deg is allready enough. But the
engine needs approx. 0.5 deg. down thrust. With an initial setting of 1.5 deg right thrust and 0.5
deg. down thrust it will be almost perfect right from the beginning. The holes in the firewall are
exactly set for this thrust angle, and as soon as the spinner is centered to the cowling, these
angles will appear automatically. You will have to use washer packs to adjust the length of your
engine. Side and down thrust is approximately built in the firewall plate, but not 100% exact due
to manufacturing tolerances.
