User Manual

Planes Gasoline Engine Mount. Drill 17/64" [6.8mm] (or 9/32" [7.2mm]) holes at the marks. Cut off the bottom of the mount as indicated on the template. Mark the top and front of the mount as shown. ❏ 2. Remove the muffler and carburetor from the
engine. This will facilitate mounting the engine and fitting the cowl.
❏ 3. The U.S. Engines 41cc is to be spaced
approximately 7/8" [22mm] from the mount (not from the firewall). If your U.S. Engine came with the 1/2" [13mm] black, plastic engine mount spacer, glue together three 1/8" [3mm] plywood engine mount spacers. If your U.S. Engine did not come with the
black, plastic spacer, glue together seven 1/8" [3mm] plywood engine mount spacers. This is most easily done by lightly coating the spacers with 30-minute epoxy and using the bolts that came with the Great Planes Gasoline Engine Mount to bolt the spacers to the engine—do not over tighten the bolts, thus deforming the plywood. Note: The straight edge of the spacers goes on the right side of the fuselage.
❏ 4. After the epoxy on the engine mount spacer
has hardened, remove it from the engine and sand the edges even and smooth.
❏ 5. Use 1/4-20 x 1-1/2" [40mm] bolts and 1/4" [6.4mm] washers (not included) to mount the engine with the plywood spacers and the plastic spacer (if included with the engine) to the engine mount. Bolt the engine mount to the firewall using the rubber bushings, washers and bolts that came with it. Mount the cowl Refer to these photos for the following two steps.
❏ 1. Use a hobby knife and sandpaper to shape four
of the six supplied 1/2" x 13/16" x 13/16" [12 x 20 x 20mm] hardwood cowl mounting blocks to match
the shape of the fuselage and the cowl.
❏ 2. Thoroughly roughen the firewall in the four
locations where the cowl mounting blocks will go. Coat the end of the blocks and the firewall with 30-minute epoxy. Allow the epoxy to “tack up” so the blocks won’t fall off, then place them on the firewall. Continue to monitor and reposition the blocks as necessary until they will stay in place. Allow the epoxy to fully harden.
❏ 3. After the epoxy from the previous step has
hardened, drill two 1/8" [3.2mm] holes through the blocks and the firewall. Cut eight 1-1/4" [30mm] pieces from the 1/8" x 12" [3.2 x 300mm] hardwood dowel. Coat the dowels and the holes in the mounting blocks with 30-minute epoxy, then use a hammer to tap the dowels all the way in.
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