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21
INSTALL THE AIR RETRACT
CONTROLS
❏
1. Use epoxy to
glue the two 5/16" x
1-3/4" [ 8mm x 44mm]
hardwood rails to the
fuel tank former and
servo tray former.
Use the embossed
marks on the servo
tray former to locate
the aft hardwood rail.
The forward hardwood
rail should be aligned
with the bottom of the
opening in the fuel
tank former.
❏
2. Glue the retract servo tray together as shown.
❏
3. Test fi t the retract servo tray in the fuselage. It
should fi t between the two hardwood rails. Drill a 1/16"
[1.6mm] pilot hole in the hardwood rails using the four
mounting holes as guides. Attach the retract servo tray
to the rails with #2 x 3/8" [9.5mm] sheet metal screws
and #2 washers. Remove the screws and the tray and
harden the screw holes with thin CA.
❏
4. Install the retract control valve in the plywood
mount. Install a .080 ball link ball and .080 nut on the
valve. Be sure to use a drop of threadlocker on the
threads of the ball link ball.
❏
5. Install the retract control valve servo in the retract
servo tray and plug it into the receiver.
❏
6. Cut off 1/2" [13 mm] from the threaded end of the
2-56 x 4" [102 mm] metal pushrod. Thread the nylon
ball socket on the pushrod. Snap the ball socket onto
the ball link ball on the retract control valve. Center the
servo arm and mark the pushrod where it crosses the
servo arm. Make a 90 degree bend at the mark. Install
the pushrod in the servo arm and install a nylon Faslink.
Cut the pushrod 1/8" [3mm] past the Faslink. Reinstall
the retract servo tray in the fuselage with the #2 x 3/8"
[9.5mm] sheet metal screws and #2 washers.
❏
7. Install a length of air line on the pressure tank.
Secure the pressure tank in the cradle with a rubber
band. To prevent the tank from sliding, a couple of dabs
of silicone adhesive can be applied to the cradle.
Summary of Contents for FW 190
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