Great Planes F4 Phantom - GPMA0440 - Manual (Page 17)

Perform steps 7 though 14 only if installing retracts
1. Use a hobby knife and sanding bar to remove the jig
tabs on the top of the ribs. Sand the TE, main spars, shear
webs and the top of the ribs flush. Sand the LE flush with
the bottom forward wing sheeting at rib R-8 only.
2. Assemble the two die-cut 1/8" plywood wing crutches
by inserting the crutch bases in the slots in the main tip
crutches (MTC).
7. From the top of the wing, use T-pins to locate the
main gear retract blocks. Trim the sheeting to fit around
the retracts.
8. Measure and cut the main retract struts 5-5/8" long
(measured from the surface of the wing).
3. Position the wing on your building board with the main
tip crutches under the wing tips at ribs R-8.
9. Mount the retracts in the wing with #4 x 1/2" sheet
4. Place enough weight on the wing to keep the main
spars in contact with the building board at rib R-1 and ribs
R-8 seated in the crutch. Glue the top LE sheeting in
position following the same procedure used for the bottom
LE sheeting. Remember, you previously made the LE
sheeting when you sheeted the bottom of the wing.
5. Trim and sand the LE sheeting flush with the front of
metal screws (not included). If you are using Robart
Retracts, install a 1-1/4" x 3/16" adjustable axle (not
included, GPMQ4282), 2-1/2" main wheel (not included,
GPMQ4223) and 3/16" wheel collars (not included,
GPMQ4308). The use of various brands of retracts may
require different or additional hardware. Before tightening
the set screws, check that there is no toe-in or toe-out
when the retracts are extended.
the sub front cap.
6. Make the two sub TE reinforcements from the leftover
1/8" x 3/8" main spars. Use 6-minute epoxy to glue the
reinforcements in the slot in rib R-3 and the sub TE.
10. Slowly retract each strut and wheel, cutting away
the bottom sheeting and ribs for clearance. Enlarge the
wheel well to 3", keeping the hole centered on the wheel.
17