O.S. engine 49PI 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.

●

ROTARY ENGINE 49PI

Due to updating and improvement, latest products may

occasionally differ from those shown in the photos.

CONTENTS

SAFETY INSTRUCTIONS AND

WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION

BASIC ENGINE PARTS

GLOWPLUG

MOUNTING THE ENGINE

BEFORE STARTING

STARTING

RUNNING-IN("Breaking-in")

PRE-FLIGHT CHECKING

SUBSEQUENT READJUSTMENT

ENGINE CARE AND MAINTENANCE

GENUINE O.S. PARTS &ACCESSORIES

ENGINE THREE VIEW DRAWINGS

ENGINE EXPLODED VIEWS

ENGINE PARTS LIST

CARBURETOR EXPLODED VIEW

& PARTS LIST

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.

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

anythingelsewhichmightignite

it.Donotsmokeorallowanyone

else to smoke, near to it.

•

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.

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.

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 carburetor.

•

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!

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,

THE NSU/WANKEL SYSTEM

Now available in a new and improved

PI(peripheral inlet) model, its outstanding

features remain its high specific power output,

its almost total freedom from vibration, its

relatively low noise level and its compact

shape.

This highly successful application of the

NSU/Wankel System to a power unit of

miniature proportions, was only 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.

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, each 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.

The engine is fitted with a conventional throttle

type carburettor that gives smooth and

progressive control of engine speed from idling

to full power. It is also supplied with a compact

matched muffler that very effectively

attenuates exhaust noise without causing

undue power loss.

Carburettor Complete

Engine Mount

Glowplug

Drive Hub

Spinner Nut

Rotor Housing

Front Housing

BASIC ENGINE PARTS Carefully insert plug, with

washer, fingertight only,

before final tightening with

the correct size plug

wrench.

Installing the glowplug

Glow plug

Washer

The role of the glowplug

With a glowplug engine, ignition is initiated by the

applicationofa1.5-voltpowersource.Whenthebattery

isdisconnected,theheatretainedwithinthecombustion

chamber remains sufficient to keep the plug filament

glowing,therebycontinuingtokeeptheenginerunning.

Ignition timing is 'automatic' : under reduced load,

allowing higher rpm, the plug becomes hotter and,

appropriately, fires the fuel/air charge earlier;

conversely,atreducedrpm,theplugbecomecoolerand

ignition is retarded.

Install a plug suitable for the engine.

(i.e. O.S. Type RE)

Use fuel containing a moderate percentage of

nitromethane unless more is essential for racing

events.

Do not run the engine too lean and do not leave the

battery connected while adjusting the needle.

However, plug life can be extended and engine

performance maintained by careful use, i.e.:

Apart from when actually burned out, a plug may

need to be replaced because it no longer delivers its

best performance, such as when:

When to replace the glowplug

Filament surface has roughened and turned white.

Filament coil has become distorted.

Foreign matter has adhered to filament or plug

body has corroded.

Engine tends to cut out when idling.

Starting qualities deteriorate.

•

Glowplug life

Particularly in the case of very high performance

engines,

glowplugs must be regarded as expendable

GLOWPLUG

A specially designed O.S. Type RE glowplug is

fitted to this engine Carefully fit plug finger-

tight, before final tightening with the correct

size plug wrench.

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