Make The Servo Hatches; Hook Up The Controls - Top Flite P-47D Thunderbolt User Manual

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15. Drill a 1/16" hole through the punch mark in
both 1/16" ply flap control horns. Add a few drops of
thin CA to the holes to harden the wood. Allow the
CA to fully harden. Sand the excess CA off and redrill
the holes. Test fit a metal 4-40 clevis to make sure it
fits well.
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16. Final sand the flaps, finishing with 400-grit
sandpaper, then use 30-minute epoxy to securely
glue the flap horns into position. Fill the remaining
gap between the two sections of the flap LE with
leftover 1/16" balsa or balsa filler.
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17. Cut a passage in the inner TE's to accommodate
the flap horns. Test fit the flaps once more to make sure
the horns do not interfere with the inner TE's. Make
adjustments if necessary.
The "belly pan" under the wing conceals the air
ducting for the supercharger. One duct carries air
from the intake in the front of the cowl back to the
supercharger (driven by the turbine) and two
smaller ducts carry exhaust gasses from the
engine to the turbine.

Make the servo hatches

Start with the right aileron hatch...
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1. Cut a hole in the bottom wing sheeting of the
right panel to fit the die-cut 1/16" plywood aileron
servo hatch cover. Start with a small hole first, then
carefully enlarge it to fit the hatch cover. As you
"zero-in" on the correct size of the hole, use the
hatch cover itself as a template to accurately trim the
wing sheeting. Note that the sides of the opening
should extend to the center of the ribs and the front
and back edges of the opening should extend
approximately 5/16" past the rails.
Refer to this photo for the following four steps.
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2. Test fit the aileron servo hatch cover into the
opening. If necessary trim the edges of the opening
or sand the edges of the hatch cover for a good fit.
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3. Securely tape the hatch cover into position. Drill
1/16" holes through the hatch cover and the servo rails.
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4. Remove the servo hatch and enlarge the holes
in the hatch cover only with a 3/32" drill bit.
Countersink the holes in the cover to accommodate
the six #2 x 3/8" flat-head screws. A Dremel # 178
cutting bit works perfectly for countersinking the holes.
If you'd rather not bother countersinking the holes, you
may use regular #2 x 3/8" screws (not supplied).
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5. Temporarily mount the hatch cover to the wing
with the screws.
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6. Make the other aileron hatch and the flap
hatches the same way.

Hook up the controls

Refer to this photo for the following four steps.
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1. Refer to the plan for the correct servo
orientation, then use the screws included with the
servos to mount both aileron and both flap servos to
two 1/2" x 1" x 1" basswood servo mounting
blocks. It will probably be necessary to trim some of
the blocks to accommodate the servo cords.