O.S. Engines 49PI 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
ABOUT THE ENGINE
BASIC ENGINE PARTS
BEFORE STARTING
INSTALLATION OF THE STANDARD ACCESSORIES
MIXTURE CONTROLS
GLOWPLUG
INSTALLATION OF THE ENGINE AND FUEL TANK
2-6
7-9
10
11-14
17
18-20
STARTING THE ENGINE &
RUNNING-IN ('Breaking')
TROUBLE SHOOTING WHEN THE
ENGINE FAILS TO START
CARE AND MAINTENANCE
15
16
ENGINE EXPLODED VIEWS & PARTS LIST
CARBURETOR EXPLODED VIEWS& PARTS LIST
O.S. GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
21-25
26-27
28-29
30-31
32-33
34
35
36
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. 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
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
ABOUT THE ENGINE
The O.S. rotary combustion engine, based
on NSU/Wankel System, was the world's
first production model engine of the rotarypiston type as invented by Felix Wankel in
1957 and produced by NSU/Wankel in 1959.
This highly successful application of the
NSU/Wankel System to a power unit of
miniature proportions, has only been made
possible by the expertise of O.S. research
and development engineers and by the
high levels of precision craftsmanship
achieved in its tooling and manufacture.
Operating principle
In place of the piston and cylinder of a
conventional reciprocating engine, the
Wankel motor has a three-lobe rotor which
moves in a circular path, while rotating
about its own axis, within a housing having
an epitrochoidal bore – i.e. a wide-waisted
figure-of eight shape. Planetary rotation is
controlled by an eccentric shaft, an
internally-toothed gear and a fixed pinion
mounted centrally on the rear cover plate.
The tips of the rotor are in continuous
contact with the housing, forming three
chambers, reach of which changes in
volume, with rotation, to effect suction,
compression, expansion and exhaust
phases, as in a four-stroke reciprocating
engine. Spring-loaded tip seals on the rotor
prevent gases from passing from one
chamber to the adjoining one and the rotor
uncovers ports, as in a two-stroke engine,
to control intake and exhaust timing.
7
Features
Almost total freedom from vibration
Relatively low noise level Pleasant sound
specific to a rotary engine
Compact shape which enables easier
installation in most models
Commercially available top-quality model
engine fuel containing 15% oil, either
synthetic or castor, can be used.
Note
Do not use commercially available low oil
content fuel.
Since this is a rotary engine designed for
model application, there are some notes to
be followed in order to run it well for a long
time. Also, handling of this engine is somewhat different from that of two-stroke and
four-stroke engines.
1.
Start the engine by an electric starter. Hand
starting is very difficult as the mixture does
not access to the glowplug easily because
the glowplug exists in the housing, not
protruding into the combustion chamber.
2.
Starting is difficult when the atmospheric
temperature is below 10 C.In this case,
warm the engine to approx. 20 C.
8
3.
Prime the engine fairly liberally with fuel and
turn the propeller more than 3 turns so that
all three chambers are primed. Start the
engine in a short time (1~2 seconds).
Prolonged application of an electric starter
(more than 4 seconds) without engine firing
will cause seizing between the side housing
and the rotor due to insufficient lubrication.
(Without firing, the fuel does not have
sufficient lubricating as the oil in the fuel is
diluted with methanol and additives.)
Try to set the needle-valve with one trial.
4.
Setting on the ground lacks sufficient
cooling, and the engine easily overheats.
When the engine is enclosed in a cowl, be
5.
sure to make ventilation holes (outlet hole
Should be lager than inlet hole.), or the
engine will overheat, which results in poor
engine running or seizing in worst case.
Do not remove the carburetor air funnel, or
6.
the engine setting may vary, which results in
poor running.
9
BASIC ENGINE PARTS
RE-2010 Silencer
Air Funnel
Front Housing
Rotor Housing
Engine Mount
Carburetor T ype 21G
BEFORE STARTING
Tools, accessories, etc. The following items
are necessary for operating the engine.
GLOW PLUG
O.S. TypeF glowplug is supplied with
the engine.
GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery leads are integrated.
FUEL PUMP
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.
Manual
Electric
Glowplug T ypeF
Drive Hub
Propeller washer
Propeller nut
10
FUEL
For this engine, use top quality
methanol-based model engine fuel
containing more than 18% oil either
synthetic or castor and between
5% and 15% 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.
11
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