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Step 14: Install the Cowl:
You will install the cowl by cutting a hole in the cowl that is specific to your engine,
muffler and way you mounted the engine to the firewall. You will need the cowl, masking
tape, Dremel tool w/cutting disk & sanding drum, ruler, cowl mounting screws.
Locate Hole in Cowl for Engine Head:
Depending upon the Type & size of engine you use, it may be neces-
sary to cut a hole in the cowl for the engine head to protrude outside the
cowl. Rather than guessing at the hole center, making a small hole then
gradually and iteratively enlarging it, GSRC will suggest a more methodi-
cal approach using a paper template.
Cut a hole in the paper template about 1/8” outside the outer dimen-
sions of the head and place the template hole over the engine head. Itera-
tively adjust the hole size for good head clearance. Tape the paper tem-
plate in place on the fuselage.
Transfer Template Pattern to Cowl:
Fold the template back, out of the way at the tape point, and remove
the engine. Place the cowl back on the fuselage and measure the distance
from the firewall front surface to the front outside cowl edge to be 5-5/8”.
Secure the cowl with masking tape. Be sure the cowl is relative straight.
Lay the template back over the cowl and trace the hole opening onto
the cowl surface using a felt tip pen.
Check Tracing:
Fold the template back and forth to check the traced line to be accu-
rate within the template hole.
Cut Rough Cowl Engine-Head Hole:
For the following and all power-tool cutting and sanding activities,
wear protective eye wear and a dust mask. Perform the cutting and sand-
ing operation in an open area where the dust will not settle on the engine,
plane, or other dust sensitive parts.
Remove the Cowl from the fuselage. Using a Dremel© tool and a
cutting disc (or other cutting device), cut a rough hole in the Cowl about
1/8” inside the traced line.
Finish Out Hole Size:
Using a Dremel© tool and a 60 - 80 grit, 1/2” sanding drum, sand the
rough- out hole to the traced line.
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