O.S. Engines 50SX 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
FEATURES OF FX SERIES ENGINES, BEFORE
INSTALLING THE ENGINE
BASIC ENGINE PARTS
NEEDLE-VALVE LOCATION
INSTALLATION OF THE ENGINE
THROTTLE LINKAGE, SILENCER
FUEL T ANK LOCATION
GLOWPLUG
FUEL, PROPELLERS
MIXTURE CONTROLS
BEFORE STARTING
11
14
16
2
8
~
~
~
~
~
10
12
12
13
15
15
17
STARTING
6
RUNNING-IN (Breaking-in)
IDLING ADJUSTMENT CHART
7
MIXTURE CONTROL VALVE ADJUSTMENT,
8
REALIGNMENT OF MIXTURE CONTROL VALVE
9
SUBSEQUENT STARTING PROCEDURE
SUBSEQUENT READJUSTMENT
CARBURETOR CLEANLINESS,
ENGINE CARE AND MAINTENANCE
ENGINE EXPLODED VIEWS &
ENGINE PARTS LISTS
CARBURETOR EXPLODED VIEWS
& PARTS LISTS
GENUINE O.S. PARTS & ACCESSORIES
ENGINE THREE VIEW DRAWINGS
MEMO
17~18
~
21
19
22
23
24
25
26
~
33
34
~
35
~
37
36
38
~
41
42
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.
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
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.
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.
•
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 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
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 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
FEATURES OF FX SERIES ENGINES
This range of engines is ideally suited to a variety
•
of R/C aircraft, including trainer, sports, aerobatic
and scale types.
A separate precision-made needle-valve unit is
•
installed at the rear, where manual adjustment is
safely remote from the rotating propeller.
With the 50SX, 61FX and 91FX, the needle-valve
•
assembly can be installed either horizontally or
vertically.
Common to accessories
Glow Plug No.8, Silicone Tube, Instruction Manual
50SX, 40/46FX
61FX
91FX
Note :
With these engines, the piston will feel tight at the
top of its stroke when the engine is cold. This is
normal. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach their intended running temperature.
873 Silencer Assembly
E-4010 Silencer Assembly
E-4020 Silencer Assembly
Needle Valve Extension Cable
BEFORE INSTALLING THE ENGINE
Installing the glowplug
Carefully insert plug, with
washer, fingertight only, before
final tightening with the correct
size plug wrench.
Connecting fuel tubing
Connect the short length of fuel tubing (supplied)
securely between the needle-valve outlet and
carburetor inlet as shown in the illustration on the
next page.
In the event of the tubing becoming damaged, it
should be replaced with a suitable length (as
indicated below) of best quality 5mm ODx2mm ID
silicone tubing. Use similar material to connect the
fuel inlet nipple to the fuel tank.
Type of engines
50SX
¡
46FX
40
Length
~
56mm 61FX
54
~
46mm
44
7
Glow plug
Washer
Type of engines
91FX
Length
54~56mm
62mm
BASIC ENGINE PARTS
Cylinder head
Throttle Stop Screw
Carburetor
Throttle
Lever
Crankcase
Fuel inlet
Drive Hub
Crankshaft
Propeller washer
Propeller nut
Glowplug
Beam Mount
Fuel inlet
Needle valve
Fuel outlet
Cover Plate
Silicone Tube
MAX-61FX
NEEDLE-VALVE LOCATION
As delivered from the factory, the MAX-61FX and
MAX-91FX
installed horizontally. However, if more convenient for
a particular installation, the needle-valve may be
reinstated vertically behind the cylinder. (See sketch
opposite.) Please note that the needle-valve knob
has a center hole and set-screw for the fitting of a
piano-wire extension (supplied with the 91FX) so that,
when relocated vertically, the extension enables
adjustments to be made without risk of burning one's
fingers on the cylinder head.
The proce
is as follows:
1.
2.
3.
8
RING have their needle-valve assembly
dure for relocating the needle-valve vertically
Using 8mm wrench, remove complete needle-valve
holder assembly including needle, from side of
cover plate.
Remove fuel inlet assembly from upper boss of
cover plate.
Transfer banjo type fuel inlet including washers, to
needle-valve holder and carefully screw complete
assembly into upper boss vacated by fuel inlet
assembly. Tighten very carefully.
4.
Use hexagon-head brass inlet holder (61FX) or
plug screw (50SX/91FX) to blank off side boss
vacated by needle- valve assembly.
61FX
Needle Extension
Inlet Holder
Fuel Inlet
Needle-Valve
Assembly
Fuel Inlet
45mm
50SX/91FX
Plug Screw (50SX/91FX)
Fuel Inlet
Needle-Valve
Assembly
Needle Extension
Needle-Valve
Assembly
Fuel Inlet
Plug Screw (50SX/91FX)
45mm
Needle-Valve
Assembly
Inlet Holder
9
INSTALLATION OF THE ENGINE
Installation in the model
A typical method of beam
mounting is shown below, left.
Rigid hardwood
(e.g. maple)
At least
15mm(5/8")
50SX
¡
40
46FX
¡
91FX
61
At least
15mm(5/8")
For 50SX, 40/46FX(Code No. 71913100)
For 60FP, 61
Mounting Screw Size
50SX, 40¡46FX
¡
91FX
61
O.S. radial motor mount
(Available as an optional extra
part. See parts list)
¡
91FX(Code No. 71905200)
3mm
4mm
Make sure that the mounting beams are parallel and
that their top surfaces are in the same plane.
CORRECT INCORRECT
Front view Side view
Top surfaces are in
the same plane.
Top surfaces
are not in the
same plane.
Re-align the surfaces
as necessary
Opposite
beam
Engine does not
rest firmly.
Top surfaces
are not in the
same plane.
How to fasten the mounting screws.
3-4mm steel nuts
Spring
washer or
lock washer
3-4mm
steel screw
Hardwood mounting beams
Use mounting screws of a diameter
(between 3mm and 4mm) appropriate
to engine size (see table left).
Tighten second
nut firmly down
onto first nut.
Tighten this
nut first.
Hardwood such
as cherry or maple.
Steel washer
O.S. radial motor
mount
(cast aluminum)
10
3.5mm steel
Allen screw
Spring
washer
THROTTLE LINKAGE
Before connecting the throttle-lever/servo linkage,
•
make sure that no part of the linkage interferes with
the internal structure of the aircraft or wiring, etc.,
when the throttle is fully open or fully closed.
Set the throttle lever linkage so that the throttle ro-
•
tor is (a) fully open when the transmitter throttle
stick is fully advanced and (b) fully closed when
the throttle stick is fully retarded.
Adjustment of the throttle rotor opening at the idling
position can then be made with the throttle trim lever on the transmitter.
(Select throttle-lever and servo-horn hole positions
that will avoid excessive pushrod travel causing the
throttle to bind at either end.)
Note:
When adjusting the throttle lever angle, relative to
the rotor,hold the rotor at about half-way between
the open and closed positions while loosening
and tightening the fixing screw, otherwise the
rotor, rotor guide screw,throttle stop screw or
carburettor body may become burred and
damaged.
SILENCER
The exhaust outlet of the silencer can be rotated to
any desired position in the following manner:
Assembly screw
Exhaust pressure nipple
1)
Loosen the locknut and assembly screw.
2)
Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
3)
Re-tighten the assembly screw, followed by the
locknut.
NOTE :
The standard expansion-chamber type silencer is
quite effective, but reduces power to some degree.
11
E-4010 Silencer
Cone baffle
Turn to requlred position
Exhaust outlet
Locknut
Reminder!
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.
Keep your hands and face away from
exhaust gas or you will suffer a burn.
FUEL TANK LOCATION
Suggested fuel tank capacities are listed opposite.
These will allow 12-13 minute flights.
Locate the fuel tank so that the top of the tank is 510mm (1/4-3/8") above the level of the needle-valve.
Be sure to use a pressurized fuel system by
•
connecting the muffler pressure nipple to the ventpipe of the fuel tank.
12
50SX
¡
40
Suggested Fuel Tank Capacities
approx 300cc
46FX
Attention to tank height
61FX
91FX
approx 350cc
approx 450cc
Fuel level
10mm
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