Install Cowl - GREAT PLANES Piper j-3 cub Instruction Manual

2. Wrap the Battery in a plastic bag, surround it with latex
foam rubber and slide it under the die-cut lower fuel tank
floor. NOTE: If your plane happens to be a little nose heavy,
you can move the battery to a different location.
3. Route the receiver antenna through the center
pushrod guide tube if you used one, and out of the fuse
bottom. If you did not install an antenna tube, route the
antenna out near the TE of the wing and attach it to the
vertical fin using a small rubber band.
4. Mount the on-off switch wherever convenient. We used
the Great Planes Switch and Charge Jack Mounting Set
(GPMM1000) which makes it very easy to charge the
battery and it looks great. The switch can be mounted on the
bottom of the fuselage opposite the exhaust as long as the
exhaust will not blow onto the switch.

Install Cowl

1. Using a hobby knife, Lexan
Moto Tool ® with a pointed bit, carefully trim around the base
of the cowl. Also, cut out the three openings in the front of
the cowl for air intakes and the engine thrust washer.
® scissors or a Dremel ®
2. Without the engine on the fuselage, test fit the cowl in
place. Round off the corners of the fuselage to obtain a good
fit. When satisfied with the fit, install the engine and mount.
3. Cut the openings in the cowl for the engine head,
needle valve and exhaust pipes. This step requires patience,
so cut a little bit, test fit and cut a little more. Do not try to
cut a lot at once because every cowl will fit a little differently.
Allow approximately 1/8" clearance all around the engine
head and muffler for cooling air flow. Position the cowl so
there is at least 1/8" clearance between the front of the cowl
and the prop. It is sometimes easier to take the muffler off
during the early stages of fitting and get the cowl to fit the
engine itself first. Then cut the cowl until the muffler will fit in
place. NOTE: Carefully monitor the temperature of the
engine during the first few test runs. Look for signs of the
heat melting the cowl or affecting the performance of the
engine. Cut larger air flow holes (both inward flow and
outward flow) if needed to keep the engine sufficiently cool.
4. Determine where the best places are to screw the cowl
in place. We have included six #2 x 3/8" sheet metal screws
which you can install as you desire. Different engine/muffler
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