21
❏
2. Position the cowl onto the fuselage over the engine/motor
and install the spinner back plate onto the prop shaft with a
prop and prop nut. (For glow engines, temporary removal of
the muffl er and needle valve may be required to fi t the cowl.).
❏
3. Insert shims from balsa or card stock the thickness of the
desired spinner gap (approximately 3/32" [2.5mm]) between
the front of the cowl and the back plate of the spinner and
tightly tape the spinner to the cowl.
Note:
If you’re using a
brushless motor with the Great Planes adjustable brushless
motor mount, no need for the shims; after the cowl has been
mounted, simply adjust the mount to move the motor forward
until the desired spinner gap has been achieved.
❏
4. Use a fi ne-point felt-tip pen to mark the aft edge of
the cowl onto both sides of the fuselage. Remove the cowl.
❏
5. Measure the distance from the lines on the fuselage to
the middle of the cowl mount blocks. Mark dots from the aft
edge of the cowl the distance you measured.
❏
6. Drill 1/16" [1.6mm] holes through the cowl at the marks.
❏
7. Same as before, reinstall the cowl, spinner back plate
and shims (if used for a glow engine) and tape the cowl to
the spinner. Make sure the cowl is accurately aligned with the
spinner back plate and the stripes on the cowl are aligned
with the stripes on the fuselage.
❏
8. Drill 1/16" [1.6mm] holes through the holes in the cowl
into the cowl mount blocks.
❏
9. Remove the cowl. Enlarge the holes in the cowl with a
3/32" [2.4mm] drill.
