Great Planes F4 Phantom - GPMA0440 - Manual (Page 15)

Perform steps 1 and 2 only if installing retracts
4. Use 30-minute epoxy to glue the 1/2" x 5/8" x 3/4"
hardwood landing gear torque blocks to the top side of the
main blocks and the plywood sides of rib R-3. Glue the 5/8"
hardwood landing gear gussets to the main block and the
plywood sides of rib R-5.
1. Use 30-minute epoxy to glue the 1/4" x 3/4" x 3-5/8"
plywood retract mounting plates into the notches in ribs
R-4 and R-5. Before the epoxy cures, glue the 5/8"
hardwood landing gear gussets under the front mounting
plates against ribs R-4 and R-5.
and torque blocks as shown on the plan. This hole must be
drilled perpendicular to the main landing gear blocks.
5. Drill a 13/64" hole through the main landing gear blocks
6. Fit the 3/16" main landing gear struts into the blocks
2. Fit the retract mechanism in place, trimming the
plywood mounting plates as required to allow the retract
to operate properly. Drill 3/32" pilot holes for the retract
mounting screws and temporarily mount the retracts on
the plywood mounting plates with four #4 x 3/8" sheet
metal screws (not included).
and fill the unused portion of the slot at each end of the main
landing gear blocks with leftover balsa. Remove the strut.
1. Check all of the glue joints, adding glue where needed.
Perform steps 3 though 6 only if installing fixed gear 2. Sand the bottom of the wing ribs, shear webs, main
spars and TE flush.
3. Place the 3/8" x 5/8" x 7-3/8" hardwood main landing
gear blocks in the notches in ribs R-3 and R-5. Mark and
cut a notch in ribs R-4. Use 30-minute epoxy to glue the
main landing gear blocks into the notches, with the groove
facing away from the building board.
3. Cut and glue four 1/16" x 4" x 30" balsa sheets, as
shown in the sketch, to make the top and bottom LE sheets.
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