Great Planes PT-60 Kit - GPMA0119 - Manual (Page 35)

DRILL WITH
A 5/64" BIT
ELEV.
THROT.
RUD.
SERVO HORN GUIDE
CUTOFF
UNUSED
ARMS
D 9. Prepare three "cross" style servo horns as follows:
A. Cut three arms from two horns These two single arm
horns will be used for the elevator and throttle
B. Drill a 5/64" hole through the second hole from the outer
end of the elevator servo horn.
D 10. Connect the receiver to the servos, switch, and
battery Turn on your transmitter and receiver, then center
the elevator, rudder and aileron servo trim levers on the
transmitter This will center the splined servo output shafts.
Install the three servo horns you prepared on the servos in
the fuse Put them on the splined servo output shafts, in
the positions shown in the photo. Turn the radio
off-receiver first, then the transmitter.
Because it's helpful to be able to move the servo tray when
balancing the model we'II stop installation of the radio at
this point, then resume after the model is balanced
Note: Although you have not yet trimmed the pushrod
wires to their final length, they should be temporarily
installed in the fuselage while balancing the model in the
next steps.
NOTE: This section is VERY important and must NOT
be omitted! A model that is not properly balanced will
be unstable and possibly unflyable.
C. Install a screw lock pushrod connector in the second
hole from the outer end of the throttle servo arm. Don't
install the retainer until the throttle's operation has
been tested.
D Cut two opposite arms off the third servo horn to make
one "long" arm.
E Drill a 5/64" hole through the second hole from the outer
end for the rudder pushrod Install a screw lock pushrod
connector, including the retainer, on the opposite arm
in the second hole from the outer end Your nose wheel
steering pushrod will attach to this connector.
D 1. Install the wing with rubber bands or bolts Accurately
mark the balance point on the bottom of the wing on both
sides of the fuselage The balance point is shown on the
plan and is located 4-1/8" (105 mm) back from the
leading edge. This is the balance point at which your model
should balance for your first flights Later, you may wish to
experiment by shifting the balance up to 1/4" forward or
back to change the flying characteristics Moving the
balance forward may improve the smoothness and arrow-
like tracking but it may then require more speed for takeoff
and make it more difficult to slow down for landing Moving
the balance aft makes the model more agile with a lighter
and snappier feel In any case, please start at the location
we recommend and do not at any time balance your
model outside the recommended range.
35