Great Planes Sequence 1.20 EP/GP ARF - GPMA1232 - Manual (Page 29)

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4. Glue the front bulkhead doubler and the side doublers
to the assembly.
5. Cut two 1" [25mm] pieces and two 2 " [50mm] pieces from
the included balsa triangle stock. Securely glue the triangle
stock pieces around the inside corners of the back plate.
6. If using a RimFire 1.20, use the included plywood RimFire
1.20 motor mount template (and a drill press if available)
to drill 1/16 " [1.6mm] pilot holes through the FRP motor
mount plate. If using a different motor, mark, then drill holes
to fi t your motor. Hint: For perfection, fasten the template to
the mount with 4-40 screws and nuts.
5/16" [8 mm]
9/16" [15 mm]
1/8" [3.2 mm]
7. Remove the plywood template, then enlarge the pilot holes
as illustrated for the RimFire 1.20.
8. If using an inrunner with a gearbox that requires additional
support, cut a hole in the rear motor mount to fi t to your
motor with whatever shock absorption preferred (usually fuel
tubing).