Mount The Cowl - GREAT PLANES Giant Super Sportster Instruction Manual

Mount the Cowl

(Remember, "Gas-only" steps are shaded.)
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1. This step is necessary only if using a gas engine.
If using a glow engine, proceed to step 2. Use coarse
sandpaper to roughen the firewall for the cowl mounting
blocks. Use 30-minute epoxy to glue both hardwood cowl
mounting blocks into position where shown. (The cowl
blocks are necessary for gas engine installation because the
Fuji 32–and probably most other gas engines–protrude
farther than the 7-1/4" [185 mm] specified for glow engines.
This means the cowl will also be farther forward, so without
the cowl mounting blocks the cowl mounting screws would
be too close to the aft edge of the cowl.)
Refer to this photo for Steps 2 and 3.
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2. Place the cowl on the fuselage over the engine and
temporarily mount the spinner back plate and prop. Align the
front of the cowl with the spinner back plate, with
approximately 1/8" [3 mm] spacing between them. Hint: If
mounting the Fuji 32, temporarily remove the carburetor and
spark plug so the cowl will fit.
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3. Holding the cowl in position, use a fine-point felt-tip
pen to draw the outline of the cowl directly onto the fuselage.
Remove the propeller, back plate and cowl.
Perform step 4A only if you have mounted a glow engine.
Perform step 4B only if you have mounted a gas engine.
Refer to this photo both for Steps 4A and 4B.
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4A. Glow Engines: Using the line around the fuselage
as a reference to take measurements from, drill six 1/8"
[3.2 mm] holes in the sides and top of the cowl so they will
be 3/16" [5 mm] behind the front edge of the firewall–this will
center the screws in the firewall.
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4B. Gas Engines: Using the line around the fuselage as a
reference to take measurements from, drill six 1/8" [3.2 mm]
holes in the sides and top of the cowl. The two top holes
should be positioned so the screws will be centered in the
cowl mounting blocks and the holes in the sides of the cowl
should be approximately 3/8" [10 mm] aft of the front edge of
the side tabs.
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5. Reposition the cowl on the fuselage. Mount the spinner
back plate and prop.
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6. Again holding the cowl in position (it may be helpful to
have an assistant), drill a 3/32" [2.4 mm] hole into the
fuselage through one of the cowl holes. Mount the cowl to
the fuselage with one #4 x 5/8" [16 mm] Phillips screw into
the hole you just drilled.
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