GREAT PLANES SU-31 Instruction Manual page 24

Almost-ready-to-fly electric 3d aerobat
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but make your adjustments smooth. Some right aileron may
be needed to keep the model from torque rolling. Use the
rudder and elevator to keep the nose pointing straight up. Be
patient as this maneuver will take a while to learn.
TORqUE ROLL
This is the same as the vertical hover but without the use of
right aileron to keep the model from rolling. If needed, you
can use a little left aileron to speed the roll up. As the model
rotates around, the controls will appear to be reversed to you
but only the orientation of the model has changed.
HARRIER
The harrier is nothing more than a high angle of attack flying
stall. Check the stall characteristics of your plane before
proceeding with this maneuver. Bring your plane across the
field at 75ft high and 100ft out away from yourself. Slowly
pull back on the elevator while reducing throttle. The nose of
the plane should come up. Depending on the plane/setup,
you may have to make constant aileron (wing walking) and
rudder corrections for this maneuver. As the nose of the plane
comes up, start adding in a little bit of power to help maintain
airspeed. The rudder is now used to turn the model. This
maneuver will take some practice as there are a lot of small
corrections made to keep most planes in the maneuver.
This is one maneuver where less control is needed. Too
much elevator and the model goes into an uncontrollable
stall. The C.G. of the plane will have a large effect on the
stability of the model during this maneuver. Some planes
perform better with more elevator deflection and a farther
forward C.G. while other planes prefer a further aft C.G. and
less elevator deflection. Elevator to flap mixing can be used
on airplanes with marginal wing area, and some planes won't
stall so elevator to spoileron mixing will be needed.
ROLLING HARRIER
Once you get comfortable with the up-right harrier, it's time to work
rolls into the mix. From an up-right harrier, add in left aileron and
change from up elevator to down elevator when inverted. If you
are comfortable with four point rolls and slow rolls, inputting rudder
on the knife edges can improve the maneuver considerably. To
turn the model, simply input the elevator or rudder a little sooner
or later in the rotation. It's all a matter of timing.
PINWHEEL
Climb vertically and bring the model to a vertical hover, but do
not stop long enough to let the torque pull the model around
(climbing or sliding slightly will not be noticeable to spectators
but will keep air flowing over the ailerons and provide you roll
authority to stop the torque). When the model is hanging,
rock the plane left with rudder, then apply full throttle and
full right rudder and hold both, completing 3/4 of a VERY
tight Knife Edge Loop and flying out Knife Edge. When done
correctly, the plane pivots around the wingtip in a very small
area. This maneuver can be done in either direction.
24

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