O.S. engine FS-52S Setup guide
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-6 of this booklet and to strictly
adhere to the advice contained therein.
●Also, please study the entire contents of this
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
It is suggested that any instructions supplied
with the aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
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SAFETY INSTRUCTIONSAND WARNINGS
ABOUT YOUR O.S. ENGINE
INTRODUCTION,BASIC ENGINE PARTS
INSTALLATION
EXHAUST HEADER PIPEAND SILENCER,
THROTTLE LINKAGE, NEEDLE-VALVE EXTENSION
PROPELLERS, FUEL
GLOWPLUG
FUELAND PRESSURE LINES,
PROPELLER AND SPINNER ATTACHMENT
TYPE 40N CARBURETTOR,
CONTROL LOCATIONS
STARTING
CONTENTS
RUNNING -IN
IDLING MIXTURE ADJUSTMENT
VALVE ADJUSTING
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW
ENGINE PARTS LIST
CARBURETTOR EXPLODED
VIEW & PARTS LIST
GENUINE PARTS &ACCESSORIES
THREE VIEW DRAWING
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1
Remember that your engine is not a "toy", but a highly efficient internal-
combustion machine whose power is capable of harming you, or others, if it is
misused.
As owner, you, alone, are responsible for the safe operation of your engine, so act
with discretion and care at all times.
If at some future date, your O.S. engine is acquired by another person, we would
respectfully request that these instructions are also passed on to its new owner.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
The advice which follows is grouped under two headings according to the
degree of damage or danger which might arise through misuse or neglect.
WARNINGS NOTES
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
2
WARNINGS
Model engine fuel is poisonous. Do not
allow it to come into contact with the eyes
or mouth.Always store it in a
clearlymarkedcontainerand
out of the reach of children.
Never operate your engine in an en-
closed space. Model engines, like auto-
mobile engines, exhaust deadly carbon-
monoxide. Run your engine only in an
open area.
Model engines generate considerable
heat. Do not touch any part of your
engine until it has cooled. Contact with
the muffler (silencer),
cylinder head or exhaust
header pipe, in particular,
may result in a serious burn.
•
•
•
•
Never touch, or allow any object to come
into contact with, the rotating
propeller and do not crouch
over the engine when it is
running.
A weakened or loose propeller may
disintegrate or be thrown off and, since
propeller tip speeds with powerful
engines may exceed 600 feet(180 metres)
per second, it will be understood that
such a failure could result in serious
injury, (see 'NOTES' section relating to
propeller safety).
•
Model engine fuel is also highly
flammable. Keep it away from open flame,
excessive heat, sources of sparks, or
anything else which might
ignite it. Do not smoke or allow
anyoneelsetosmoke,neartoit.
•
3
NOTES
•
•
•
•
•
This engine was designed for model
aircraft. Do not attempt to use it for any
other purpose.
Mount the engine in your model securely,
following the manufacturers' recommenda-
tions, using appropriate screws and lock-
nuts.
Be sure to use the silencer (muffler)
supplied with the engine. Frequent
exposure to an open exhaust may
eventually impair your hearing.
Such noise is also likely to cause
annoyance to others over a wide area.
Fit a top-quality propeller of the diameter
and pitch specified for the engine and
aircraft. Locate the propeller on the shaft so
that the curved face of the blades faces
forward-i.e. in the direction of flight. Firmly
tighten the propeller nut, using the correct
size wrench.
If you remove the glowplug from the engine
and check its condition by connecting the
battery leads to it, do not hold the plug with
bare fingers.Use an appropriate tool or a
folded piece of cloth.
4
NOTES
•
•
Always check the tightness of the propeller
nut and retighten it, if necessary, before
restarting the engine, particularly in the
case of four-stroke-cycle engines. If a
safety locknut assembly is provided with
your engine, always use it. This will prevent
the propeller from flying off in the event of a
"backfire", even if it loosens.
If you fit a spinner, make sure that it is a
precision made product and that the slots
for the propeller blades do not cut into the
blade roots and weaken them.
Preferably, use an electric starter. The
wearing of safety glasses is also strongly
recommended.
•
•Discard any propeller which has become
split, cracked, nicked or otherwise rendered
unsafe. Never attempt to repair such a
propeller: destroy it. Do not modify a propeller
inanyway,unlessyouarehighlyexperienced
in tuning propellers for specialized
competition work such as pylon-racing.
Take care that the glow plug clip or battery
leads do not come into contact with the
propeller. Also check the linkage to the
throttle arm. A disconnected linkage could
also foul the propeller.
After starting the engine, carry out any
needle-valve readjustments from a safe
position behind the rotating propeller. Stop
the engine before attempting to make other
adjustments to the carburettor.
•
•
5
NOTES
•
•
•
•
•
Adjust the throttle linkage so that the engine
stops when the throttle stick and trim lever
on the transmitter are fully retarded.
Alternatively, the engine may be stopped by
cutting off the fuel supply. Never try to stop
the engine physically.
Take care that loose clothing (ties, shirt
sleeves, scarves, etc.)do not come into
contact with the propeller.Do not carry loose
objects (such as pencils, screwdrivers, etc.)
in a shirt pocket from where they could fall
through the propeller arc.
Do not start your engine in an area
containing loose gravel or sand.
The propeller may throw such material in
your face and eyes and cause injury.
For their safety, keep all onlookers
(especially small children) well back (at
least 20 feet or 6 meters) when preparing
your model for flight. If you have to carry
the model to the take-off point with the
engine running, be especially cautious.
Keep the propeller pointed away from you
and walk well clear of spectators.
Warning! Immediately after a glowplug-
ignition engine has been run and is still
warm, conditions sometimes exist whereby
it is just possible for the engine to abruptly
restart if the propeller is casually flipped
over compression WITHOUT the glowplug
battery being reconnected. Remember this
if you wish to avoid the risk of a painfully
rapped knuckle!
6
INSTALLING THE GLOWPLUG
Carburettor
Fit washer to glowplug and
insert carefully into cylinder-
head, making sure that it is
not cross-threaded
before tightening firmly.
BASIC ENGINE PARTS
Having pioneered the development of four-
stroke cycle model aircraft engines in 1976,
O.S. has maintained a continuing program of
technological advancement, examples of
which, would include the line of beautiful
multi-cylinder engines, with many new
engine designs continually under
development.Oneofthelatter is this new FS-
52S model. Closely resembling the FS-48S
externally, the FS-52S combines increased
performance and improved durability at
virtuallynoincreaseinoveralldimensionsor
weight.
Crankshaft
Glow plug
Washer
Drive Hub
Crankcase
Beam Mount
Silencer
Rocker Cover
INTRODUCTION
Push Rod Cover
Intake Pipe
7
INSTALLATION 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
3.5mm steel nuts
3.5mm steel screw
Spring washer or
lock washer
15mm min.
15mm min.
Hardwood such as
cherry or maple.
Spring washer
3.5mm steel Allen screw
Front view
CORRECT
Side view
Top surfaces are in the same plane.
Re-align the surfaces
as necessary
INCORRECT
Top surfaces are not
in the same plane. Opposite beam
Top surfaces
are not in the
same plane.
Engine does
not rest firmly.
Rigid hardwood
(e.g. maple)
At least
15mm(19/32")
At least
15mm(19/32")
Installation in the model
A typical method of beam
mounting is shown below,left. O.S. radial motor mount
(Available as an optional extra part.
See parts list)
Make sure that the mounting beams are parallel
and that their top surfaces are in the same plane.
8
NEEDLE-VALVE EXTENSION
The needle-valve supplied with this engine is
designed to accept an extension so that, when the
engine is enclosed in a cowling, the needle-valve may
be adjusted from the outside.
An L-shaped rod, of appropriate length, may be
inserted in the needle-valve knob center hole and
secured by tightening the set-screw with a 1.5mm
Allen key.
Before connecting the throttle to the 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.
Fit these in the following sequence.
Screw the header pipe into the cylinder head until it
bottoms, then unscrew sufficiently to achieve the
desired exhaust angle and tighten the locknut securely
with a 14mm wrench. Screw the silencer onto the outer
end of the header pipe and tighten the second locknut.
The application of a heatproof silicone sealant to the
threads of the exhaust system is recommended to
reduce the risk of joints loosening and the leakage of
exhaust gases and oil residue.
Reminder:
Model engines generate considerable heat and
contact with the header pipe or silencer may result in
a serious burn. If you need to tighten the silencer
joints, which may loosen when they are hot, use a
thick folded cloth for protection.
EXHAUST HEADER PIPE & SILENCER
THROTTLE LINKAGE
9
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