Great Planes 38% Extra 330S ARF - GPMA1290 - Manual (Page 19)

19
Mount the Cowl
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1. Use manilla folder material or thin cardstock to make
templates for the bottom two cowl mounting screws. Tape
the templates to the fuselage with the hole in the templates
centered over the cowl mounting screws.
❏
2. Remove the screws. With the muffl ers off the engine,
tape the cowl into position. Mark the holes in the screw
templates directly onto the cowl.
❏
3. Remove the cowl and drill 1/8" [3.2mm] holes through
the cowl where you made the marks for the screws.
❏
4. Reposition the templates over the screw holes in the
next two blocks. Mount the cowl with the bottom two 4-40 x
1-1/4" [32mm] SHCS and nylon washers. Mark the holes in
the templates onto the cowl.
❏
5. Remove the cowl, drill the next two holes, and repeat
until all seven cowl screw holes have been drilled.
❏
6. Use coarse sandpaper to roughen the inside of the cowl
over each screw hole. Use medium CA to glue the 1/32" [.8mm]
plywood cowl reinforcements centered over each hole.
1-1/4" [32mm]
Diameter
6-3/8" [162mm]
DA 150 Exhaust Pipe Template
(From Manilla Folder)
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7. If using the DA 150cc engine, use the dimensions
in the illustration to make a template for the exhaust pipe
cutout from thin cardstock or manila folder material. If using
a different engine, make a template from measurements
taken from your engine.
❏
8. Temporarily mount the muffl ers to the engine. Tape the
template to the bottom of the fuselage over the exhaust pipes.