running at peak performance. In cold weather the air is denser thus
more fuel is needed and in hot weather, the opposite applies.
FRESH AIR INTAKE
When using an engine cowling, such as in the case of most WWII
fighter planes, a fresh air intake must be established on the outside
of the fuselage. This is necessary due to hot, contaminated air
inside the cowling. In testing we have found that the engine will
loose power and RPM if a fresh air source is not supplied to the
carburetor.
In fabricating a fresh air source for your engine, a plenum area
must be established just in front of the carburetor.
This consists of a box area that is considerably larger than the
carburetor’s intake throat. If a plenum area is not used, it will cause
the engine to loose power and RPM plus not respond well to throttle
increases.
Periodic maintenance and inspection
is a must on this very
complex engine. Your radial engine should be inspected
periodically, approximately every 1 hour of run time, for loose
fasteners (bolts, nuts, screws, etc.). Checking the tightness of all
fasteners is a good ideal. Never over tighten any fastener. The
screws and nuts are very small (to obtain the scale look of the full
scale engine).
After 20 hours of run time, all the screws holding the cylinders to
the crankcase need to be replaced. These screws are sold in sets
and are not covered by the warranty as they are considered
expendable items. Go to the parts exploded view to find screws and
