❍
2. With the transmitter and receiver still on, check all the
control surfaces to see if they are centered. Use a straightedge
to help get them set correctly. If necessary, adjust the clevises
on the pushrods to center the control surfaces.
❍
3. Make certain that the control surfaces and the carburetor
respond in the correct direction as shown in the diagram above.
If any of the controls respond in the wrong direction, use the
servo reversing switches in the transmitter to reverse the servos
connected to those controls. Be certain the control surfaces
have remained centered. Re-adjust if necessary.
For added safety and convenience, the throttle should be set up
so that the engine can be stopped using the throttle trim. To do
this remove the clevis from the carburetor arm and move the
throttle pushrod so that the carburetor is completely closed with
the throttle stick and trim lever on the transmitter fully
back/down. Next, adjust the clevis so that when the clevis is
connected the carburetor barrel is in the fully closed position.
Then test the trim lever by advancing it to full. This will be a fast
idle position with the carburetor barrel open slightly (about 1/32"
or .8mm).
Now move the throttle stick forward to full. Make sure that the
carburetor barrel opens all the way. If it doesn’t open far enough
or opens too far (bending the rod) move the pushrod and screw-
lock pushrod connector in or out on the servo arm and/or the
clevis on the carburetor arm to gain or reduce movement. The
throw will be correct when the carburetor barrel will stop fully
open at the same time the throttle stick reaches full. With the
throttle set up properly, you should be able to run the engine
with the trim lever set midway to the full position (adjusted for a
smooth but slow idle). Then when it is time to stop the engine,
simply pull back the trim to close the carburetor and the engine
will stop running.
Set the Control Throws
Use a Great Planes AccuThrow
™
(or a ruler) to accurately
measure and set the control throw of each control surface as
indicated in the chart that follows. If your radio does not have
dual rates, we recommend setting the throws at the low rate
setting.
Note: The throws are measured at the widest part of the
elevator, rudder and ailerons.
These are the recommended control surface throws:
High Rate
Low Rate
ELEVATOR:
5/8" [16mm] up
1/2" [13mm] up
5/8" [16mm] down
1/2" [13mm] down
RUDDER:
3/4" [19mm] left
5/8" [16mm] left
3/4" [19mm] right
5/8" [16mm] right
AILERONS:
5/8" [16mm] up
1/2" [13mm] up
5/8" [16mm] down
1/2" [13mm] down
IMPORTANT: The Tower Trainer 60 MKII ARF has been
extensively flown and tested to arrive at the throws at which
it flies best. Flying your model at these throws will provide
you with the greatest chance for successful first flights. If,
after you have become accustomed to the way the Tower
Trainer 60 MKII ARF flies, you would like to change the
throws to suit your taste, that is fine. However, too much
control throw could make the model difficult to control, so
remember, “more is not always better.”
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