10
It is suggested to use as heavy and rigid as possible engine mounting for highest performance and
safe running. Conventional wooden mounting beams should be of rigid hardwood and of at least
12mm or 5/8-in square section. Use at least 3mm steel screws, such as Allen type, with locknuts, for
bolting the engine to the bearers..
INSTALLATION
CORRECT
Top surfaces are in the same plane.
INCORRECT
Front view
Side view
Re-align the surfaces
as necessary
Opposite beam
Top surfaces are not in the
same plane.
Engine does not rest firmly.
Top surfaces are not
in the same plane.
Make sure that the mounting beams are parallel and that their
top surfaces are in the same plane.
11
How to fasten the mounting screws.
Hardwood mounting beams
Radial motor mount (cast aluminum)
Tighten second nut
firmlydown onto first nut.
Tighten this nut first.
Steel washer
3mm steel nuts
3mm steel screw
Spring washer or
lock washer
12mm min.
12mm min.
Hardwood such as
cherry or maple.
Spring washer
3mm steel
Allen screw
●
Make sure that these mounting beams are
accurately aligned and firmly integrated with
the airframe, reinforcing the adjacent
structure to absorb vibration. Use 3mm or
larger steel screws, preferably Allen type
hexagon socket head cap screws, with
washers and locknuts, for bolting the engine
to the bearers.
NEEDLE-VALVE EXTENSION
The needle-valve supplied with these
engines is designed to incorporate an
extension so that, when the engine is
enclosed within the fuselage, the needle-
valve may be adjusted from the outside.
Cut a commercially available rod to the
required length, bend one end to an L shape,
insert it into needle's center hole and secure
it by tightening the set-screw in the needle-
valve knob with 1.5mm. Allen key.