O.S. Engines FS81-a User Manual
It is of vital importance, before attempting to operate
you r engin e, to read the genera l 'SAFE TY
INSTRUCTIONS AND WARNINGS' section on pages
2-6 of this booklet and to strictly adhere to the advice
contained therein.
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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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FOUR CYCLE ENGINE FOR PUMP SYSTEM
1
CONTENTS
2-6
7
8
9
10-13
20
21
27-28
34-35
36-37
38
17-18
SAFETY INSTRUCTIONS AND WARNINGS
ABOUT YOUR O.S. ENGINE
NOTES WHEN APPLYING AN ELECTTRIC STARTER
ABOUT THE ENGINE
ENGINE PARTS NAME
BEFORE STARTING
INSTALLATION
INSTALLING SILENCER
FUEL TANK & LINES
PROPELLER
GLOWPLUG
MIXTURE CONTROLS
CARE OF FUEL PUMP & REGULATOR
STARTING
RUNNING -IN ("Breaking-in")
IDLE MIXTURE ADJUSTMENT
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW & PARTS LIST
CARBURETOR EXPLODED VIEWS
& PARTS LIST
GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
29-30
31-33
39
40
14-16
19
22
24-26
23
2
Remember that your engine is not a "toy", but a highly efficient internalcombustion 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
Th e se cov e r even t s whic h
mig h t inv o lve se rious (in
extreme circumstan ces, 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.
3
WARNINGS
Model engine fuel is poisonous. Do not
allow it to come into contact with the eyes
or mouth. Always store it in a
clearly marked container and
out of the reach of children.
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. 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 (sil encer),
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 f ue l is also hig hly
flammable. Keep it away from open flame,
excessive heat, sources of sparks, or
anything else which might
ignite it. Do not smoke or allow
anyone else to smoke, near to it.
4
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' recommendations, using appropriate screws and locknuts.
Be sure to use the silencer (muffler)
sup plied wit h 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.
Install 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.
5
NOTES
Always check the tightness of the propeller
nut and retighten it, if necessary, before
restarting the engine. Also, check the
tightness of all the screws and nuts before
restarting the engine.
If you install 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
uns afe. Never attempt to repair such a
propeller: destroy it. Do not modify a propeller
in any way, unless you are highly experienced
in tu ni ng prope ll er s for s pecialized
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 carburetor.
6
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 glowplugignition 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!
7
NOTES WHEN APPLYING
AN ELECTRIC STARTER
Do not over-prime. This could
cause a hydraulic lock and damage
the engine on application of the
electric starter.
If over-primed, remove glowplug,
close needle-valve and apply
starter to pump out surplus fuel.
Cover the head with a rag to
prevent pumped out fuel from
getting into your eyes.
1
2
3
8
STANDARD ACCESSORIES
F-5030 Silencer Assembly
Silencer Body
ABOUT THE ENGINE
Exhaust Header Pipe
(W/M11 Lock Nuts)
Please note that this engine is not supplied
with any tools (e.g. Allen keys, wrenches, etc.)
This is a FS (Alpha) series of the single
cylinder overhead valve four cycle engine
equipped with a fuel pump system. It offers
broad power band to suite a variety models
types. The PD-08 pump designed for bigger
models and the 61R carburetor integrated with
regulator ensures stable fuel delivery
irrespective of model attitude and fuel level
change. It is suitable not only for 70 size scale
and sport models but also for aerobatic models
which require stable power and linear throttle
response. O.S. pump system is easy to handle
because it supplies fuel direct to the carburetor
without pressurizing the fuel tank. (Be sure to
vent the fuel tank). New lubricating system
eliminates the need for breather tubing from
the crankcase. The F-5030 silencer and Type
F plug are supplied as standard.
Glowplug TypeF
Note: Since the 61R carburetor is
integrated with the regulator, it cannot be
turned 180 degrees to reverse needle
position.
9
Rocker Cover
Drive Hub
Propeller Washer
Crankcase
Beam Mount
Cover Plate
Exhaust Header Pipe
ENGINE PARTS NAME
Glow Plug TYPE F
Lock Nut
F-5030 Silencer Body
Cylinder Head
Intake Manifold
Propeller Nut
Exhaust Header Pipe Nuts M11
Carburetor
Type 61R
Regulator
Pump Unit PD-08
10
Tools, accessories, etc. The following items
are necessary for operating the engine.
BEFORE STARTING
The choice of propeller depends on the design
and weight of the aircraft and the type of flying
in which you will be engaged.
Determine the best size and type after
practical experimentation. As a starting point,
refer to the props listed in the accompanying
table. Slightly larger, or even slightly smaller,
Propellers
Type
props than those shown in the table may be
used, but remember that the propeller noise
will increase, due to higher rpm or if a largerdiameter/lower-pitched prop is used.
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.
Reminder!
Warning:
Make sure that the propeller is well
balanced. An unbalanced propeller and/or
spinner can cause serious vibration which
may weaken parts of the airframe or affect
the safety of the radio-controlled system.
DO NOT forget the WARNINGS and NOTES
on propeller and spinner safety given on
front pages.
Scale
Sport & Aerobatic
Size(DxP)
13x7-9, 14x6-7
11
Since the FS -81-P is intended to
be started with an electric starter,
the addition of a spinner assembly
for centering the starter sleeve is desirable.
Use a heavy-duty, well balanced spinner either
of metal or plastic.
Spinner
FUEL
The FS -81-P should be operated on a methanol based
fuel containing not less than 18% (volumetric) castor oil,
or a top quality synthetic lubricant (or a mixture of both),
plus a small percentage (5-20%) of nitromethane for
improved flexibility and power. (The carburetor is
adjusted a little on the rich side at the factory for a fuel
containing 20% lubricant and 15% nitromethane.) Some
commercial fuels also contain coloring additives as an
aid to fuel level visibility. In some cases, these additives
hav e indicated sligh tly negative effects on the
performance.
Model engine fuel is poisonous. Do not
allow it to come into contact with the eyes or
mouth. Always store it in a clearly marked
container and out of the reach of children.
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
anyone else to smoke, near to it.
Reminder!
We would suggest that you use such fuels only if you
are satisfied that they do not adversely affect running
qualities when compared with familiar standard fuels.
When changing to a fuel brand or formula that is
different from the one to which you are accustomed, it is
a wise precaution to temporarily revert to in-flight
running-in procedures, until you are sure that the
engine is running entirely satisfactorily.
12
A fuel tank of approximately
320cc capacity is suggested.
This allows around 14 minutes flying time,
dependent upon the type of fuel used, the size
of propeller and on the amount of full-throttle to
part-throttle operation throughout the flight.
Fuel Tank
GLOW PLUG
O.S. Type F glowplug is supplied with the engine.
GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery leads are integrated.
Alter natively, one of the
purpose-made manual or
electric fuel pumps may be used to transfer fuel
directly from your fuel container to the fuel tank.
FUEL PUMP
Manual
Electric
Electric Starter and
Starter Battery
Required when starting
the engine.
12-Volt lead-acid battery
Electric
Starter
Install a filter on the outlet tube of your
refueling container to prevent entry of
foreign matter into fuel tank. O.S. ‘Super Filters’
(large and small) are available as optional extras.
O.S. Super Filter (Fuel Can Filter)
S
To prevent the pickup from adhering to
the tank wall under suction and restricting
fuel flow, slots may be filed in the end of
the weight. Alternatively, an O.S. NonBubble Weight is available as an optional
extra.
O.S. Non-Bubble Weight
13
It is recommended to install a good
in-line filter between the fuel tank and
carburetor to prevent entry of foreign matter
into the carburetor.
Fuel Filter
SILICONE FUEL LINE
Heatproof silicone tubing of approx.
5mm o.d. and 2mm i.d. is required for the
connection between the fuel tank and engine.
8mm
TOOLS
HEX Screwdriver
SCREWDRIVER
Necessary for engine installation.
1.5mm, 2.5mm
Necessary for carburetor adjustments.
Phillips Screwdriver
No.2, etc.
Socket Screwdriver
5mm, 5.5mm, 7mm
LONG SOCKET WRENCH WITH PLUG GRIP
Recommen de d fo r easy remova l an d
replacement of the angled and recessed
glo wplug, the O.S.Long Socket Wrench
incorporates a special grip.
End Wrenches
12-14mm, etc.
Needle Nose Pliers
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