O.S. Engines 61RX-H User Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-5 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 model, 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 OF THE CARBURETOR
INSTALLATION OF THE ENGINE
BEFORE STARTING
FACTS ABOUT GLOW PLUGS
FUEL,CARBURETOR CONTROLS
STARTING
RUNNING-IN,ADJUSTMENT
2~5
~
10
9
11
12
~
13
~
15
13
15~18
SUBSEQUENT READJUSTMENTS
6
7
8
CARBURETTOR CLEANLINESS
ADJUSTING CHART
INSTALLATION OF THROTTLE SERVO
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW &
PARTS LIST
CARBURETOR EXPLODED
VIEW & PARTS LIST
THREE VIEW DRAWING
O.S. GENUINE PARTS & ACCESSORIES
1
19
19
20
21
~
29
22
30~31
32
~
33
34
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
•
Never touch, or allow any
object to come into contact
with, the rotating parts.
Model engine fuel is poison-
•
ous. 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.
WARNINGS
•
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
These engine were designed for model
•
helicopters. Do not attempt to use it for any
other purpose.
Mount the engine in your model securely, fol-
•
lowing the manufacturers' recommendations,
using appropriate screws and locknuts.
Install an effective silencer (muffler). Frequent
•
close exposure to a noisy exhaust (especially
in the case of the more powerful high-speed
engines) may eventually impair your hearing
and such noise is also likely to cause
annoyance to others over a wide area.
Check the linkage to the throttle arm before
•
each flight.
Avoid sudden high r.p.m. immediately after the
•
engine is started, as the clutch will engage and
you may be struck by the rotor.
After starting the engine, carry out any needle-
•
valve readjustments after stopping the rotor by
closing the throttle to the lowest r.p.m..
Stop the engine before attempting to make
other adjustments to the carburetor.
Use an electric starter. The wearing of safety
•
glasses is also strongly recommended.
Press the rotor head down securely.
Take care that the glow plug clip or battery
•
leads do not come into contact with rotating
parts.
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.
4
Take care that loose clothing (ties, shirt sleeves,
•
scarves etc.) do not come into contact with the
rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from
where they could fall through the rotor disc.
For their safety, keep all onlookers (especially
•
small children) well back (at least 20 feet or 6
metres) 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.
Hold the rotor securely and keep well clear of
spectators.
Warning! lmmediately after a glowplug-ignition
•
engine has been run and is still warm,
conditions sometimes exist whereby it is just
possible for the engine to restart when turned
over WITHOUT the glowplug battery being
reconnected. Remember this if you wish to
avoid the risk of accidents.
NOTES
5
INTRODUCTION
The MAX-61SX-H RING "WC" is an up-rated
version of the MAX-61SX-H RING helicopter
engine. It is aimed at FAI World
Championship(hence the suffix 'WC') Class
F3C competition. Performance has been
increased and the Type 60B carburetor has
been modified for easier adjustment. High
quality and high performance have been
confirmed in exhaustive flight testing and
in F3C contest results. The 61SX-H has a
traditional sideexhaust layout, whereas the
61RX-H features a rear exhaust for users
who prefer such a configuration. In all other
respects, the two models are of identical
design.
Note:
Because of initial tightness, a
standard electric starter may have
difficulty in rotating the engine when
cold, before it has been adequately
run-in. In this case, use a high-torque
type starter.
DO NOT, however, confuse tightness
with the symptoms of hydraulic lock
caused by an excess of fuel within the
cylinder - often the result of overpriming.
Attempting to force the engine to turn
over in this condition may cause
internal damage. Instead, remove the
glowplug, invert the engine and eject
surplus fuel from the combustionchamber.
6
BASIC ENGINE PARTS
Heatsink Head
Carburettor
Typr 60B
Propeller nut
Crankshaft
Drive Hub
Crankcase
MAX-61SX-HRING"WC"
Glowplug
Beam Mount
Cover Plate
INSTALLING THE GLOWPLUG
Install the washer on the
glowplug and screw
carefully into cylinderhead, making sure that it
is not cross-threaded
before tightening firmly.
Glow plug
Washer
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly
fitted into its intake boss. Secure it as follows.
1.
Loosen the retainer screw, rotate the carburetor to
its correct position and press it well down into the
intake boss, compressing the rubber gasket as
shown in the sketch, before re-tightening screw.
2.
Rotate the retainer screw gently until it stops, then
tighten a further 120-180 degrees. Do not overtighten the screw as this will damage the thermoinsulator.
Carburetor Rubber
Retainer
screw
Gasket
Positioning Mark
7
0.2mm gap
INSTALLATION OF THE ENGINE
The under-surfaces of all O.S. engine beam
mounting lugs are precision machined flat and
exactyly parallel to the engine's horizontal axis. It is
essential that the engine mounts in the model are
also accurately made and aligned. If they are not,
they will cause stress and distortion within the engine
itself, probably resulting in loss of performance and
internal damage.
The recommended screws for securing the engine to
the engine mounts in the model are 4mm or 6-32 NC
steel Allen type. It is also advisable to use lock
washers or LOCTITE to prevent nuts from loosening.
CORRECT
Front view
Top surfaces are in the same plane.
INCORRECT
Top surfaces are not
in the same plane.
Re-align the surfaces as necessary
Make sure that only the under-surfaces
of the engine’s mounting lugs are in
contact with the engine mount.
If the crankcase body touches the
mount, chamfer the edges of the mount.
8
Side view
Top surfaces are not in the
same plane.
Engine does not rest firmly.
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.
2 Glowplug
O.S. No.8 glowplug is installed in the engine.
3 Glowplug battery
The power source for heating the glowplug may be
either a large heavy-duty 1.5volt dry cell, or preferably,
a 2-volt rechargeable lead-acid cell .
1.5 volt heavy-duty
dry battery
or 2 volt rechargeable
lead-acid cell (at least 5Ah)
If a 2-volt cell is employed,
use a resistance wire, as
shown, to reduce applied
voltage, otherwise element
will overheat and burn out.
Warning (Very hot)
Never touch the
nichrome wire
while the battery
is connected.
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.
Resistance coil
(nichrome wire)
4 Plug wrench
Used for tightening glowplug. The
O.S. long plug wrench is available
as an optional accessory.
5 Battery leads
These are used to conduct current
For tightening
glowplug
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
Battery leads
the right, are commercially available.
9
6 Fuel bottle or pump
For filling the fuel tank, a simple,
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.
7 Fuel container filter
Install a filter on the outlet tube of
your refuelling container to prevent
entry of foreign matter into the fuel
tank
Fuel bulb
Fuel pumps
Fuel Can Filter
Manual
Electric
8 Silicone tubing
This is required for the
connection between the fuel
tank and engine.
9 Hexagon starting shaft
This shaft mounted on an
electric starting motor is driven
into the main body of a
helicopter to turn the engine.
10 Electric starter and starter
battery
An electric starter is recommended for starting.
10
Silicone tube
12V Battery
Starter
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