Control Throw Adjustment; Balance The Model Laterally - GREAT PLANES Piper J-3 Cub Instruction Manual

Control Throw Adjustment

By moving the position of the clevis at the control horn
toward the outermost hole, you will decrease the amount of
throw of the control surface. Moving it toward the control
surface will increase the amount of throw. If these
adjustments don't accomplish the job, you may need to work
with a combination of adjustments by also repositioning the
pushrod at the servo end. Moving the pushrod towards the
center of the servo horn will decrease the control surface
throw – outward will increase it.
Note: Throws are measured at the widest part of the
elevators, rudder and ailerons. If your radio does not have
dual rates, set the control throws to halfway between the
specified high and low rates. We recommend the following
control surface throws as a starting point:
Control Surface Throws
High Rates
Elevator 1-1/8" up [28mm]
1-1/8" down [28mm]
Ailerons 3/4" up [19mm]
3/4" down [19mm]
Rudder 1-1/2" right [38mm]
1-1/2" left [38mm]
One leading cause of crashes is flying an airplane with its
control throws set differently from those recommended in the
instructions. The Great Planes AccuThrow
you quickly and easily measure actual throws first, so you can
make necessary corrections before you fly. Large, no-slip
rubber feet provide a firm grip on covered surfaces without
denting or marring the finish. Spring tension holds AccuThrow's
plastic ruler steady by each control surface. Curved to match
control motions, the ruler provides exact readings in both
standard or metric measurements. .
Route the antenna to the tail of the model. You may use your
preferred method or the method we use in the Great Planes
model shop. Drill a 1/4" [6mm] hole through the fuse side in
the proximity of the receiver. Cut a 1/2" [13mm] long piece
Low Rates
5/8" up [16mm]
5/8" down [16mm]
9/16" up [14mm]
9/16" down [14mm]
1" right [25mm]
1" left [25mm]
™ (GPMR2405) lets
21
of fuel tubing and install it in the hole. Install a strain relief
(as shown in the sketch), then route the antenna through the
fuel tubing to the bottom of the fuse at the tail. Use a rubber
band to attach the antenna to a T-pin. Do not cut or shorten
the antenna wire. Leave any excess antenna wire hang free.
4-CHANNEL
TRANSMITTER
4-CHANNEL
TRANSMITTER
4-CHANNEL
TRANSMITTER
4-CHANNEL
TRANSMITTER
❏ Make sure the control surfaces move in the proper
direction as illustrated in the sketch.

Balance the Model Laterally

IMPORTANT: Do not confuse this procedure with "checking
the C.G." or "balancing the airplane fore and aft."
Now that you have the basic airplane nearly completed, this
is a good time to balance the airplane laterally (side-to-
side). Here is how to do it:
❏ 1. Assemble the model in as in preparation for flight. (No
fuel is required for this procedure.)
❏ 2. With the wing level, lift the model by the engine
propeller shaft and the bottom of the fin post (this may
require two people). Do this several times.