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INSTRUCTIONS
FOR
IMPORTANT:
Before attempting to operate your FS-705,
please read through these instructions so as to familiarize
yourself with the controls and other features of the engine.
Also, pay careful attention
to the recommendations
con-
tained
in the "Safety
Instructions and Warnings"
leaflet
enclosed.
INSTALLATION
Use sturdy engine mounting beams: i.e. at least as strong as
would be used for a two-stroke engine of 15cc, or greater,
displacement.
Make
sure
that
these
beams
are
firmly
integrated
with the airframe,
reinforcing the internal sur-
rounding structure as necessary to absorb vibration.
Engine
installation should be made in such a way that basic main-
tenance,
including
the checking
and
adjustment of valve
clearances,
can be conveniently
carried
out.
As an aid to
aligning the engine on its mounting beams, a simple mount-
ing hole template is supplied with the engine.
As an alternative to horizontal
beam
mounting, a special
O.S. radial motor
mount
is available, as an optional extra
part, for use where firewall mounting is required.
SILENCER ASSEMBLY
Installation procedure is as follows.
1. Screw
the exhaust
header
pipe
into the exhaust
port
until it "bottoms", then unscrew
it just sufficiently to
achieve
the required exhaust outlet angle.
Secure the
pipe in this position by tightening the locknut firmly
against the cylinder head with the wrench supplied.
2. Screw the silencer onto the end of the header pipe and
tighten locknut firmly.
Note:
It is advisable to apply silicone sealant at the joints to prevent
leakage of exhaust gas and loosening of nuts.
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CARBURETTOR
THROTTLE
The
needle-valve
and
throttle
lever
locations
are
inter-
changeable by reversing the carburettor.
This can be done
as follows:
Remove
the carburettor carefully by unscrewing the two
screws which secure both carburettor and choke valve.
(See
Photo
1.)
If the carburettor
remains difficult to remove,
slightly loosen the two screws which secure the intake pipe
to the cylinder head.
After reversing the carburettor, re-insert it into the intake
pipe gently, taking care not to damage the O-ring
in the
carburettor by using force.
Intake pipe
Ha
Nid ring
Carburettor
fixing screws
Set screw
i
Mee
lever
Hexagon nut
Cap screw
Choke rubber pad
Photo 1
CHOKE VALVE
|
The FS-70S
is equipped with a spring-loaded choke valve.
The choke
valve operating
lever can
be located right or
left by transposing the hexagon nut and cap screw.
SPECIFICATIONS
11.50 cc (0.702 cu.in.)
25.8 mm
(1.016 in.)
22.0 mm
(0.866 in.)
2,000 ~ 12,000 r.p.m.
Displacement
Bore
|
Stroke
Practical R.P.M.
Output
1.1 BHP/11,000 r.p.m.
Weight
570 g (20.1 oz.)
FUEL TANK
The suggested fuel tank size is 270cc or 9% oz. This will
give approximately
12 minutes
running time when
some
part-throttle operation
is included.
Locate the fuel tank so
that the centre
line of the tank is 10 to
15mm below the
centre line of the needle-valve.
Note:
If the model
is left unattended
with
the
fuel
tank
filled,
fuel
may
flow into the carburettor,
causing
it
to
"flood"
and
making
the engine difficult
to
start.
Take appropriate
action
to prevent this.
FUEL
The FS-70S runs on standard commercially available model
glowplug engine fuel.
Fuels containing castor-oil and/or
synthetic
lubricants
are acceptable, but for the best per-
formance and reliability,
a fuel containing 5 — 15% nitro-
methane is recommended.
For
consistent
performance
and
long
engine
life, it Is
advisable
to use good quality fuel containing
16 to 20%
lubricant.
(The carburettor
is adjusted
with
a fuel containing 20%
lubricant when the engine leaves the factory.)
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GLOWPLUG
An O.S. Type "F" glowplug is fitted to the engine.
With a four-stroke engine, ignition of the fuel charge takes
place at every fourth stroke of the piston instead of every
second
stroke.
Because
of this, some
conventional
two-
stroke glowplugs will not suit this engine.
For general use,
the special O.S. Type F glowplug is recommended.
PROPELLER
The choice of propeller depends on the design and weight
of the model
and on the type of flying envisaged.
Deter-
mine the best size and type after practical experiment.
As
starting points, suggested propellers are listed below.
For sport & stunt
13%x8, 14x7, 11x7 (3-blade)
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