Great Planes P-51D Mustang 40 Kit - GPMA0175 User Manual

Page 39

The following steps (16 - 20) should be delayed and

coordinated with the "balancing" section, later in this
book.

D 16. While holding the rudder and elevators in the neu-

tral position, mark where the pushrod wires cross the holes in
the servo wheels where each pushrod will be attached.

D 17. Remove the elevator and rudder pushrods and make
"Z-bends" at the marks you just made. Cut off the excess
pushrod wire.

D 18. Unscrew the nylon clevises, re-insert the pushrods,

and replace the clevises. Remove the servo wheels and work
the Z-bends into the holes (drill out the holes in the servo
wheels to 5/64" if necessary). Finally, place the servo wheels
back onto the servos and check the operation of the elevator
and rudder.

We recommend the following

CONTROL SURFACE THROWS:

NOTE: Throws are measured at the widest part of the
elevator and rudder.

ELEVATOR: (High Rate)..,

(Low Rate) ..

RUDDER:

(High Rate)..

(Low Rate) ..

AILERONS: (High Rate)..,

(Low Rate) ..

5/8" up

1/2" down

3/8" up
5/16" down

1-3/8" right
1-3/8" left

7/8" right
7/8" left

9/32" up
9/32" down
3/16" up
3/16" down

NOTE: If your radio does not have "dual rates", then
set up the control surfaces to move at the high rate
throws. These control surface "throws" are approxi-
mate and provide a good starting point for the first
flights with your P-51D Mustang. You may wish to
change the throws slightly to provide the smoothness
or quickness that you prefer.

D 19. Securely anchor the pushrod guide tubes to F-4

using cross-braces cut from scrap 1/8" balsa.

D 20. Attach the throttle pushrod to the throttle servo.
NOTE: We recommend using a DuBro "E-Z connector" (or
similar) for this hookup, for ease of installation and adjust-
ment.

D 21. If you are using retracts, install your retract servo at

this time. Refer to the plans and photos.

D 21. Hook up your radio system and test the operation of
all controls.

INSTALL RECEIVER, SWITCH AND
BATTERY

D 1. Wrap your receiver and battery in plastic bags, then

wrap with foam rubber.

D 2. Secure the battery to the fuselage just aft of F-2.

The battery must be secure, but must be surrounded by foam
rubber to protect it from hard vibrations. Therefore, after

wrapping with foam rubber, we recommend securing it to the
fuselage with a plywood restraint similar to that shown on the
plan, or using hooks and rubber bands. NOTE: If you later
find the airplane to be tail-heavy, it may be necessary to move
the battery to a location under the fuel tank (in front of F-2).

D 3. Secure the receiver to the fuselage, just aft of the

battery, in the same manner.

Route the receiver antenna in one of the following

D 4.

ways:

Route the antenna along the inside of the fuse side
and out of the fuse top, just behind the canopy.
Anchor the antenna to the lop of the fin with a rubber

band.

From the receiver, run the antenna directly through
the left fuse side, then back to the stab.

Install another "pushrod guide tube" along the inside
of the fuse, along the bottom, exiting just forward of
the tailgear. Insert the antenna through the tube, and
leave the excess length trail behind.

D 5. Mount the on-off switch to the front of F-3, using

double-sided "servo tape," and run a 1/16" pushrod wire out
the left side of the fuse, so you can operate the switch without
removing the wing.

FIT COWL

NOTE: Photos show 2-cycle engine, side mounted with
Tatone "Pitts-style" muffler.

D 1. If you examine the cowl carefully, you will see some

faint guidelines for trimming. These lines are more visible on
the inside of the cowl. Following these guidelines will result

in a cowl that is just slightly oversize, which allows you to

"fine tune" the fit of the cowl.

D 2. Trim the excess material from the cowl, along the

guidelines.