O.S. Engines FS-30S User Manual
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.
CONTENTS
SAFETY INSTRUCTIONS AND WARNINGS
ABOUT YOUR O.S. ENGINE
INTRODUCTION,BASIC ENGINE PARTS
INSTALLATION
INSTALLATION OF CHOKE ROD, NEEDLE VALVE
EXTENSION
SILENCER,
LINKAGE OF THROTTLE LEVER
BEFORE STARTING
FUEL AND PRESSURE LINES
ADVICE ON SELECTION OF FUEL,
GLOEPLUG & PROPELLER
ST AR TING THE ENGINE
2-6
10-12
13-14
15-21
RUNNING -IN
CARBURETOR
7
CARBURETOR AIR-BLEED ADJUSTMENT
8
TROUBLE SHOOTING WHEN THE
ENGINE FAILS TO START
9
VALVE ADJUSTING
10
12
CARE AND MAINTENANCE
GENUINE PARTS & ACCESSORIES
ENGINE EXPLODED VIEWS & PARTS LIST
CARBURETOR EXPLODED VIEWS
& PARTS LIST
THREE VIEW DRAWING
MEMO
21
22-23
24
25-26
27-29
30
31
32-35
36-37
38-39
40
1
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
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.
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
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
WARNINGS
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 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.
NOTES
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
2
Model engine fuel is also highly
flammable. Keep it away fr om 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.
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 (silencer),
cylinder head or exhaust
header pipe, in particular,
may result in a serious burn.
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' recommendations, using appropriate screws and locknuts.
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.
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.
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.
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 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
unsafe. Never attempt to repair such a
propeller: destroy it. Do not modify a propeller
in any way, unless you are highly experienced
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 carburetor.
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 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!
6
This manual handles the following two versions.
FS-30S, FS-40S
The FS Series engines are up-to-date
overhead-valve four-str oke-cycle engines for
model aircraft use and are the outcome of a
long period of technical development.
The FS Series engines are produced by the
world's oldest and largest model engine
manufacturing company; a company which
also pioneered the quantity production of
model four-cycle engines.
Accessories
FS-30S
F-2010 Silencer Assembly
FS-40S
Silencer Body
Choke rod
INSTALLING THE GLOWPLUG
Install washer on glowplug and
insert carefully into cylinder-head,
making sure that it is not crossthreaded before tightening firmly.
Glow plug
Washer
BASIC ENGINE PARTS
Glow plug
Carburetor
Fuel inlet
Breather nipple
Cover plate
7
Rocker Cover
Exhaust pipe
Lock nut
Propeller
nut
Drive Hub
Crankcase
Beam Mount
Propeller
Washer
FS-30S
INSTALLATION
Installation in the model
A typical method of beam
mounting is shown below,left.
At least 12mm
(1/2") for FS-30S
At least
15mm(19/32") for FS-40S
Make sure that the mounting beams are parallel
and that their top surfaces are in the same plane.
CORRECT
At least 12mm
(1/2") for FS-30S
At least
15mm(19/32") for FS-40S
O.S. radial motor mount
(Available as an optional extra part.
See parts list)
Rigid hardwood
(e.g. maple)
INCORRECT
How to fasten the mounting screws.
3mm steel nuts
for FS-30S
3.5mm steel nuts
for FS-40S
Spring washer or
lock washer
3mm steel screw
for FS-30S
3.5mm steel screw
for FS-40S
Tighten second nut firmly
down onto first nut.
Tighten this nut first.
Steel washer
Hardwood mounting beams
3mm steel Allen screw
for FS-30S
3.5mm steel Allen screw
for FS-40S
Spring washer
Hardwood such as
cherry or maple.
Front view
Top surfaces are in
the same plane.
Side view
Top surfaces are not
in the same plane.
Re-align the surfaces
as necessary
Engine does not rest firmly.
Opposite beam
Top surfaces
are not in the
same plane.
INSTALLATION OF CHOKE ROD
(FS-40S)
The FS Series engines are equipped with selfreopening choke valves.
Cut the choke rod (supplied) to the length indicated,
then secire the rod by tightening the set screw, using
1.5mm Allen wrench, after installing the engine.
Releasing the
choke rod allows
the choke valve
to open.
Frame sides
of fuselage
Choke rod
1.5mm
Allen key
O.S. radial motor mount
(cast aluminum)
8
NEEDLE VALVE EXTENSION
The needle-valve supplied with these engines 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.
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.
1.5mm Allen key
Set-screw
Set-screw
approx.
7mm
approx.
2mm
Choke rod
9
SILENCER
Installation for FS-30S and FS-40S
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.
Then, screw the silencer onto the end of the header
pipe and tighten locknut firmly. Re-check tightness of
locknuts when engine is hot.
LINKAGE OF THROTTLE LEVER
First, ensure that the throttle rotor is fully closed when
the throttle-lever is in the closed position. Adjust rotor
stop screw if necessary. Then couple the lever to the
throttle-servo so that the rotor is fully closed when the
transmitter throttle stick and trim lever are in the fully
retarded position.
BEFORE STARTING
Tools, accessories, etc.
The following items are necessary for operating the
engine.
1 Fuel
Model glowplug engine fuel of good quality, preferably
containing a small percentage of nitromethane. (See
"Advice on selection of fuel, glowplug and propeller")
2 Glowplug
O.S. Type F glowplug is installed in the engine.
3 Propeller
Suggested propellers are shown in the ADVICE ON
SELECTION OF FUEL & PROPELLER section.
4 Glowplug battery
The power source for heating the glowplug may be a
1.2volt Ni-cd battery a large heavy-duty 1.5volt dry
cell, or a 2-volt rechargeable lead-acid cell
(accumulator).
10
If a 2-volt cell is employed,
use a resistance wire, as
shown, to reduce applied
voltage, otherwise element
1.5 volt heavy-duty
dry battery
or 2 volt rechargeable
lead-acid cell (at least 5Ah)
will overheat and burn out.
Warning (Very hot)
Never touch the nichrome wire while the battery is
connected.
Resistance coil
(nichrome wire)
Battery leads
Adjust applied voltage by changing the position of clip on
resistance coil until glowplug element is glowing bright red.
Raise
voltage to
increase
brightness.
Lower voltage to
reduce brightness.
5 Plug wrench
Used for tightening glowplug.
The O.S. long plug wrench is available
as an optional accessory.
6 Battery leads
These are used to conduct current from the battery to
the glowplug. Basically, two leads, with clips, are
required, but, for greater convenience, twin leads with special
glowplug connectors, as shown on
the right, are commercially available.
Battery leads
7 Fuel tank
For installation in the model, a 150cc(5oz.) for
FS-30S and FS-40S tank is suggested.
These will allow 10 minute flight.
8 Fuel bottle or pump
For filling the fuel tank, a simple,
Fuel bulb
Fuel pumps
polyethylene "squeeze" bottle, with a
suitable spout,is all that is required.
Alternatively, 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.
11
For tightening
glowplug
Manual
Electric
9 Electric starter and starter battery
An electric starter is recommended
for starting.
10 Fuel can filter
Install a filter in the outlet line of your refuelling
container to prevent entry off oreign matter into
the fuel tank. (Refer to of STARTING THE
ENGINE section.)
11 Silicone tubing
This is required for the connection
between the fuel tank and engine.
3
Fuel Can Filter
FUEL AND PRESSURE LINES
Connect suitable lengths of silicone tubing, as
illustrated, after installing the engine.
Attention to tank height
Muffler to tank pressure line
Fuel level
Note: When cutting silicone tubing···
Use knife or razor blade
*If you should need to clean the silicone tubing, use methanol
or glow-fuel, not gasoline or kerosene.
Silicone tubing
Do not use wire cutters
or pliers.
Silencer (muffler) pressurized fuel system
To reduce variation in fuel "head" and ensure steady
fuel delivery at the carburetor, it is advisable to employ
a silencer (muffler) pressurized fuel system, i.e. to use
the silencer outlet nipple to pressurize the fuel tank as
shown at left.
Locate the fuel tank so the top of the tank is
5-10mm(1/4-3/8") above the level of theneedle-valve.
5-10mm
12
ADVICE ON SELECTION OF FUEL, GLOWPLUG & PROPELLER
Fuel
Use a good quality commercial fuel or one of the
blends shown in the table. Fuel "A" is suitab le for
running-in and ordinary use. Fuel "B" is for use
when more power is required and for improved
flexibility. Note that even a small quantity of
nitromethane (3-5%) will improve flexibility,
making the needle-valve adjustment less critical
and improving throttle response. Use only
materials of the highest purity. Synthetic oils are
permissible but are less tolerant of a "lean run"
than castor-oil. If , therefore, a synthetic lubricant
is used in the fuel, readjust the needle-valve to
a slightly richer setting, as a safety measure, in
case the fuel/air mixture becomes too lean
through maneuvers in flight. If a higher nitro fuel
is used, the engine should be checked out to
make sure that it is sufficiently run-in to operate
on that particular fuel without overheating. Do not
use fuels containing less than 18% lubricant.
13
A
Methanol
Castor Oil
Nitromethane
Reminder!
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.
PROPELLER
Suggested propeller sizes are given in the table. As
the ideal propeller diameter, pitch and blade area vary
according to the size, weight and type of model, final
propeller selection will require in flight
experimentation.
Reminder!
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.
75%
20%
5%
B
65%
20%
15%
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