O.S. Engines FS-200S - Manual (Page 6)

10
INSTALLATION
It is suggested to use Lock Washers (available as an optional
extra) with engine installing screws or apply LOCTITE to the
screws to prevent them from loosening.
Because the FS-200S is a powerful, large-displacement,
single-cylinder four-stroke-cycle engines, it is essential to use
very substantial engine mounting. Conventional wooden
mounting beams should be of rigid hardwood and of at least
15mm or 5/8-in square section.
Make sure that these mounting beams are accurately aligned
and firmly integrated with the airframe, reinforcing the
adjacent structure to absorb vibration. Use 5mm or larger
steel screws, preferably Allen type hexagon socket head cap
screws, with washers and locknuts, for bolting the engine to
the bearers. As an alternative to wooden beam mounting, a
special O.S. cast aluminium radial motor mount, complete with
5mm mounting screws, is available as an optional extra part
(Code No.71904200) , when front bulkhead (firewall) type
mounting is called for. Engine installation should, be made in
such a way that basic maintenance can be conveniently
carried out.
How to fasten the mounting screws.
Hardwood mounting beams
O.S. radial motor mount
(cast aluminum)
Tighten second nut firmly
down onto first nut.
Tighten this nut first.
Steel washer
5mm steel nuts
5mm steel screw
Spring washer
or lock washer
15mm min.
15mm min.
Hardwood such as
cherry or maple.
Spring washer
5mm steel
Allen screw
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
THROTTLE LINKAGE
Before connecting the throttle to its servo, make sure that
the throttle arm and linkage safely clear any adjacent part
of the airframe structure, etc., as the throttle is opened
and closed.
Connect the linkage so that the throttle is fully closed
when the transmitter throttle stick and its trim lever are at
their lowest settings and fully open when the throttle stick
is in its fully-open position..
Carefully align the appropriate holes in the throttle arm
and servo horn so that they move symmetrically and
smoothly through their full travel.
NEEDLE-VALVE EXTENSION
The needle-valve supplied with this engine 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. For this purpose, a Needle
Valve Extension Cable Set is supplied with the engine. If a
longer extension is reguired, 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.
Needle Valve Extension Cable Set
Set Screw
Knob
Cable