Electric Motor Installation - Hangar 9 P-51D Mustang 20cc Instruction Manual

137. Attach the tail gear doors to the fuselage with epoxy or
silicone adhesive or contact adhesive. Use low-tack tape to
hold the doors in position until the adhesive fully cures.
 RUDDER AND RUDDER LINKAGE INSTALLATION
138. Hinge the rudder to the fi n. The top of the rudder will align
with the top of the fi n. The olive drab control horn is also be
installed. Follow the procedure outlined earlier for the aileron
hinges and control horns.
139. Remove the nut from one end of the 36-inch (914mm) rudder
pushrod. Slide the pushrod into the pushrod tube associated
with the rudder control horn. Use a hobby knife with a #11
blade to remove the covering from the pushrod exit at the
rear of the fuselage. Slide a silicone tube on a clevis. Thread
the nut and clevis on the rudder pushrod. Attach the clevis to
the rudder control horn.
140. Center the rudder servo using the radio system. Place the
servo arm on the servo so it is 90-degrees to the rudder
servo. Attach the pushrod to the servo arm 5/8-inch (16mm)
from the center of the servo arm.
 ELECTRIC MOTOR INSTALLATION
141. Use a felt-tipped pen to extend the centerlines on the front of
the motor box.
P-51D Mustang 20cc
142. Position the X-mount on the front of the motor box, aligning
it with the centerlines. Use a clamp to hold the mount while
marking the mounting holes on the motor box with a felt-
tipped pen.
143. Remove the mount from the motor box. Use a drill and 9/64-
inch (3.5mm) drill bit to drill the holes to attach the X-mount
to the motor box.
144. Use a drill and 9/64-inch (3.5mm) drill bit to drill the holes to
attach the motor box to the fi rewall.
145. Place the mounting template on the fi rewall. Use low-tack
tape to hold the template in position. Use a drill and 7/32-inch
(5.5mm) drill bit to drill the four holes in the fi rewall to attach
the motor box.
146. Use an M4 x 15 machine screw and M4 washer to pull the
M4 blind nuts into the back of the fi rewall.
 Use a large washer between the screw and firewall
to prevent compressing the wood on the firewall.
25 EN