Great Planes Super Sportster 40 MkII Kit - GPMA0205 - Manual (Page 19)

D 9. Cut a notch 1/8" x 3/32" in both corners of the die-cut
3/16" balsa F-4C. Center and glue F-4C to F-4B and also to
the forward edge of all aft stringers. Notch 3/32" from the
forward corners of both bottom stringers as shown in the
photo. These notches will provide a recess for the forward
side sheeting.
D 3. Drill an 11/64" diameter hole at each of the four
die-punch marks on F-1A, then install the mount using four
6-32 x 1" machine screws, #6 flat washers, and
6-32 blind nuts. Tighten the machine screws all the way to
draw the blind nuts into position, then loosen them slightly
to allow the mount to be adjusted to fit the engine. Secure
the blind nuts to the firewall with a drop or two of medium
CA around the flange.
The Great Planes adjustable engine mount is simple and
convenient to use. It may be used to mount most .40 - .60
two-stroke and .40 - .70 four-stroke engines. Nose gear
bearings are incorporated in the mount and work whether
the mount is horizontal or vertical. The bearing hole is 5/32"
[4 mm] diameter.
D 1. Cut or break the "spreader bar" from each mount half.
Carefully trim any extra material left by the spreader bar
from each mount half. The surfaces where the spreader
bars were attached must be smooth to allow the mount
halves to fit together. Trim the flashing off any rough edges
if necessary. Assemble the mount halves as shown.
D 2. Draw centerlines on F-1A by connecting the punch
marks on the firewall.
D 4. Slide the engine mount halves apart until the engine
mounting lugs will sit flat on the beams. Adjust the mount
until the firewall centerline is centered between the "tick"
marks on the mount. Tighten the 6-32 screws to hold the
mount firmly in position against the firewall. Position the
engine so that the backplate of a spinner will be 4-15/16" in
front of the firewall. Mark the engine mounting holes on the
mount. Remove the engine and drill a 7/64" hole through
the beams at each mark. Install the engine with the 6-32 x
3/4" sheet metal screws that have been provided with
this kit.
Note: When installing an 0. S. .70 4-stroke engine, you will
need to remove the choke mechanism in order to position
the engine far enough back on the mounting rails to
achieve the 4-15/16" distance from the firewall.
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