19
30% Ultimate ARF
Shim the engine out if necessary to
get approximately 1/8” clearance.
Move the engine left or right and up
and down till the spinner back plate
matches the cowl. When satisfied
with the fit, use a long drill to drill
the motor mount holes. Remove the
dry wall screws one at a time and
drill and install the motor mount
bolts.
Measure the firewall and draw a
line down the center. Off set this
line 1/8” to the left side of the
plane. Measure up 4-1/2” from the
bottom of the firewall and draw a
line across the firewall. Center the
engine up on the two lines. The best
way to get the engine perfectly
aligned with the cowl is to attach the
engine to the firewall with #6x3/4”
dry wall screws. You don’t have to
drill a pilot hole, just put one in the
top and one in the bottom. They make
such a small hole that you can move
the engine slightly and put another
one in. Install the cowl making the
cutouts for the cylinder head and
muffler and check the fit of the cowl
to the spinner back plate.
