GREAT PLANES Gee Bee Instruction Manual page 20

12. Cut a hole in the center of the dummy engine large
enough to clear the thrust washer of the engine. Position the
dummy engine over the engine. For proper positioning the
oil sump should be at the bottom of the fuselage and the top
cylinder should be at the top-center of the fuselage. Mark
the area where the dummy engine covers the engine's
cylinder head. Cut this part of the dummy engine away.
13. Drill 1/8" [3mm] holes into the bottom-center of each
rocker cover and on the marks on the case of the dummy engine.
14. Insert a 1/8" x 3" [3mm x 76mm] aluminum tube in
each of the holes you drilled. Make sure that each fits well,
and then remove the tubes from the engine.
15. Paint the dummy engine with a fuel proof paint. Paint
the cylinders and the area around them flat black and the
engine case a light gray. After the paint is dry insert the
aluminum tubes into the dummy engine. Hold them in place
by applying a small amount of epoxy to each tube on the
back side of the dummy engine. You can add additional
detail to the dummy engine by drilling a small hole in each
cylinder to accept the spark plug wires. Use small gauge
wire (not included) for the spark plug wires.
16. Measure into the cowl from the trailing edge of the
cowling 2" [50mm] and make a few reference marks. Using
220-grit sandpaper, sand the entire inside of the cowl in the
area that you have made the marks. This is the area the cowl
ring will contact the cowl. Sand the front 1-1/2" [38mm] of the
inside of the cowl to prepare it for the dummy engine. Wipe
the areas you've sanded with rubbing alcohol to clean away
the residue.
20