O.S. Engines 61VF - Manual (Page 2)

GLOW PLUG
Since the compatibility of the glow-plug and fuel can have a con-
siderable effect on performance and reliablity, it is suggested
that the user selects the R/C type plug found most suitable after
tests. Recommended O.S. glow-plugs are No. 8 and No. 9.
PROPELLER
Suggested propellers for pattern flying are 11 x 7 - 8 . The
suitability of the prop. depends on the size and weight of the
model and the type of flying. Determine the best size and type
after the engine has been run in. Check the balance of propeller
before fitting it to the engine. Unbalanced propellers cause
vibration and a loss of power.
Wooden propellers are to be preferred. Some nylon propellers
are not strong enough to withstand the high power output of
this engine and a thrown blade can be very dangerous.
SILENCER
As this engine has been designed primarily for use with a tuned
length exhaust silencer system, a conventional silencer is not
supplied. Any of the tuned pipe silencers currently available for
10cc engines may be used by inserting, with the aid of silicone
tubing, a short length of 18—20 mm o.d. aluminium tubing
between the exhaust adaptor (supplied with the engine) and the
tuned silencer. The length of the intermediate tube should be
determined initially in accordance with the instructions issued
with the tuned silencer and then adjusted, as necessary, in accor-
dance with the prop and fuel used, after test flights.
Generally speaking, this intermediate tube length will require to
be between 6 cm (2.4") and 10 cm (4"). Alternatively, a special
O.S. exhaust header pipe is available as an optional extra part.
CARBURETTOR
The special O.S. automatic carburettor described in the attached
instruction sheet is fitted, as standard, to this engine. An exhaust
pressurised fuel system should be used with this carburettor for
best results.
P A R T S LIST
27101000
27101602
27102008
27103005
26704007
26705004
27106007
27107004
27108001
29008219
28009002
45010002
Code No. Description
Crankcase
Front Housing
Crankshaft
Cylinder & Piston Assy. (ABC)
Cylinder Head
Connecting Rod
Piston Pin
Cover Plate
Drive Washer
Woodruff Key
Propeller Washer
Propeller Nut
Code No.
27113004
26714006
26617004
9R731002
27130000
29081004
29081719
27126109
*27126202
*72101300
*72101103
Description
Screw Set
Gasket Set
Piston Pin Retainer
Ball Bearing (Front)
Ball Bearing (Rear)
Carburettor Complete (7D)
Carburettor Retainer
Exhaust Adaptor Complete
Exhaust Header-Pipe Complete
Silicone Tubing Set
Tuned Silencer
Optional parts
The specification is subject to alteration for improvement without notice.
Exhaust Header-Pipe Silicone Tubing Tuned Silencer
O.S. ENGINES MFG CO LTD
6-15 3-chome Imagawa Higashisumiyoshi-ku
Osaka 546, Japan. TEL. Osaka (06) 702-0225
57912