Operating Instructions Motor OS Max 25 LA II Glow -S08512354

S
8mm
ABOUT THE ENGINE
STANDARD ACCESSORIES
BASIC ENGINE PARTS
Cylinder head
Carburetor
Type 22F
Crankshaft
Propeller Nut
Propeller washer
Crankcase
Cover Plate
Glowplug
Beam Mount
Drive Hub
INSTALLATION
It is suggested to use as heavy and rigid as possible
engine mounting for highest performance and safe
running. Install the engine on a plastic mount using at
least 3mm steel screws, such as Allen type, with
locknuts, for bolting the engine to the bearers.
THROTTLE LINKAGE
Before connecting the throttle to its servo, make sure
that the throttle arm and linkage safely clear any
adjacent part of the airframe structure, etc., as the
throttle is opened and closed. Connect the linkage so
that the throttle is fully closed when the transmitter
throttle stick and its trim lever are at their lowest
settings and fully open when the throttle stick is in its
fully-open position. Carefully align the appropriate holes
in the throttle arm and servo horn so that they move
symmetrically and smoothly through their full travel.
INSTALLING SILENCER
Secure the silencer to the engine by means of two
retaining screws supplied after the engine is securely
mounted to a test bench or a model.
Make sure that these mounting beams are
accurately aligned and firmly integrated with the
airframe, reinforcing the adjacent structure to absorb
vibration. Use 4mm or larger steel screws,
preferably Allen type hexagon socket head cap
screws, with washers and locknuts, for bolting the
engine to the bearers.
O.S. Radial Motor Mount
A special O.S. radial motor mount (Code
No.71908100) is available, as an optional extra, for
use where firewall type mounting is required.
1
)
2
)
3
)
Make sure that the propeller is well balanced. An
unbalanced propeller and/or spinner can cause serious
vibration which may weaken parts of the airframe or
affect the safety of the radio-controlled system.
Since the 25LAII is intended to be started with an electric
starter, the addition of a spinner assembly for centering
the starter sleeve is desirable. Use a heavy-duty, well
balanced spinner either of metal or plastic.
Warning:
The choice of propeller depends on the design and
weight of the aircraft and the type of flying in which you
will be engaged. Determine the best size and type
after practical experimentation. As a starting point,
refer to the props listed in the accompanying table.
Slightly larger, or even slightly smaller, props than
those shown in the table may be used, but remember
that the propeller noise will increase, due to higher rpm
or if a larger-diameter/lower-pitched prop is used.
PROPELLERS
FUEL
Recommended for easy removal and replacement of the
angled and recessed glowplug, the O.S.Long Socket
Wrench incorporates a special grip.
Fuel Filter
Long Socket Wrench With Plug Grip
BEFORE STARTING
It is recommended to install a good in-line filter
between the fuel tank and carburetor to prevent
entry of foreign matter into the carburetor.
To prevent the pickup from adhering to the tank
wall under suction and restricting fuel flow,
slots may be filed I the end of the weight.
Alternatively, O.S. Non-Bubble Weight is
available as an optional extra.
O.S. Non-Bubble Weight
O.S. Super Filter (Fuel Can Filter)
Install a filter on the outlet tube of your refueling
container to prevent entry of foreign matter into fuel
tank. O.S. ‘Super Filters’ (large and small) are
available as optional extras.
GlowPlug Igniter
Commercialy available handy glowplug
heater in which the glowplug battery and
battery leads are integrated.
Fuel Pump
Manual
Electric
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.
Electric Starter and Starter Battery
Required when starting the engine.
12-Volt lead-acid battery
Electric Starter
A fuel tank of approximately 150cc capacity is
suggested. This allows around 6-7 minutes flying time,
dependent upon the type of fuel used, the size of
propeller and on the amount of full-throttle to part-throttle
operation throughout the flight.
Fuel Tank
Install the engine with the propeller intended for your
model. Open the needle-valve to the advised
starting setting and start the engine. If the engine
stops when the glow plug battery is disconnected,
open the needle-valve to the point where the engine
does not stop. Run the engine for one minute with
the throttle fully open, but with the needle-valve
adjusted for rich, slow "four-cycle"operation.
RUNNING-IN (“Breaking-in”)
All internal-combustion engines benefit from extra care
when they are run for the first few timesknown as
running-in or breaking-in.
This allows the working parts to mate together under
load at operating temperature. Therefore, it is vitally
important to complete the break-in before allowing the
engine to run continuously at high speed and before
finalizing carburetor adjustments.
However, because O.S. engines are produced with the
aid of the finest modern precision machinery and from
the best and most suitable materials, only a short and
simple running-in procedure is called for and can be
carried out with the engine installed in the model.
The process is as follows.
1.
FUEL TANK LOCATION
Attention to
tank height
How to stop the engine
Pull down the throttle lever and trim lever on the
transmitter fully.
6.
7.
5.
Attention :
Do not choke the carburetor air intake when applying
the starter. This could cause an excessive amount of
fuel to be drawn into the cylinder which may initiate a
hydraulic lock and damage the engine.
VERY IMPORTANT!
Before being operated at full power (i.e. at full-throttle
and with the needle-valve closed to its optimum setting)
the engine must be adequately run-in, otherwise there is
a danger of it becoming overheated and damaged.
Connect battery leads to glowplug.
Apply the starter and press the starter switch for 5-6
seconds to prime the engine.
Bring electric starter into contact with spinner-nut or
spinner and depress starter switch for one or two
seconds. Repeat if necessary. When the engine
starts, withdraw the starter immediately.
Check that the needle-valve is closed.
(Do not overtighten.) Now open the needle-valve
counter-clockwise 2.5 to 3 turns to the starting setting.
3.
4.
Open the throttle approx. one-third.
Turn needle-valve clockwise to close
(for leaner mixture)
Turn needle-valve counter-clockwise
to open (for richer mixture)
Mark
Close
Open
STARTING
Be sure to use an electric starter to start the engine.
Fill the fuel tank with fuel. When filled, prevent fuel
flowing into the carburetor with a commercially
available fuel stopper, etc. Release the stopper
before starting the engine.
1.
2.
Starting procedure is as follows:
Make sure that plug element glows red, and install
the plug in the cylinder head.
Locate the fuel tank as close to the engine as possible to minimize fuel level pressure variation.
Be sure to use a pressurized fuel system by
connecting the muffler pressure nipple to the
vent-pipe of the fuel tank.
The Fuel line pickup weight should be 10mm away
from the back of the tank.
Position the fuel tank so that approximately 1/3 of the
tank height is above the center line of the needlevalve.
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.
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!
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.
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 appropri-
ate 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.
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
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.
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.
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).
Never operate your engine in an enclosed space.
Model engines, like automobile engines, exhaust
deadly carbon-monoxide. Run your engine only in
an open area.
It is of vital importance, before attempting to operate your
engine, to read the general 'SAFETY INSTRUCTIONS
AND WARNINGS' in the following section 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.
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
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.
The E-2030 silencer reduces exhaust noise
effectively. You can turn the exhaust pipe of the
silencer 360 degrees to change the direction to fit
your airplane.
The newly designed 22F carburetor has a slanting
needle for safety reason.
Glow Plug No.6 (suppplied with the engine)
E-2030 Silencer Assembly
Silencer Retaining Screw (M3x27 2pcs.)
The exhaust outlet of the silencer can be rotated to
any desired position in the following manner:
Loosen the locknut and assembly screw.
Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
Re-tighten the assembly screw, followed by the
locknut.
It is recommended to seal the fitting faces of
engine exhaust and silencer with silicone sealant.
SPINNER
Make sure that the tank is well rinsed out with
methanol or glow fuel before installation and that
the pickup weight is well clear of the bottom of the
tank when held vertically.
Note:
Make sure that the throttle linkage is set so that
the throttle is fully closed when the throttle lever
as well as trim lever on the transmitter are fully
pulled down.
MAX-25LAII is designed for 25 size scale and sport
airplanes.
MAX-25LAII is an easy-to-tune standard airplane
engine for the beginners and advanced.
Plug (commercially available)
For carburetor
Approx. 10mm
Approx.
1/3
Carburetor Center Line
For Silencer
Approx.
2/3
2-stroke engine for airplane
ENGINE CONSTRUCTION
With this engine, the piston will feel tight at the
top of its stroke (TDC) when the engine is cold.
This is normal. The cylinder bore has a slight
taper. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach operating temperature.
Piston
Cylinder
Liner
Crankshaft
Near TDC
Slight taper
When the engine is cold.
When the engine is hot.
Note on silicone sealant
Do not over-apply
silicone sealant
When applying silicone sealant to the engine's exhaust,
do not over apply as the excess sealant may get into
the engine's internal parts and possibly foul the
glowplug causing the engine to quit or experience
abnormal engine operation. If this happens, remove the
head, clean out the sealant, and replace the glowplug.
9x5
9x5-6
Trainer & Sport
Running-in
SIZE(DxP)
Select, by practical tests, the most suitable fuel from
among the best quality fuels available in your country
for model use. For the best performance, a fuel
containing 5% to 20% nitromethane is preferable.
Lubricants may be either castor-oil or a suitable
synthetic oil ( or a blend of both ) provided that they
are always of top quality.For consistent performance
and long engine life, it is essential to use fuel
containing AT LEAST 18% lubricant by volume. If,
however, the adoption of a different fuel is
unavoidable, check the engine for the first few flights
on the new fuel, by temporarily reverting to the
running-in procedure.
The connection between the fuel tank and the engine.
2.5mm ID
O.S. SPEED SILICONE FUEL LINE
(optional extra)
During subsequent flights, the needle-valve can be
gradually closed to give more power. However, if the
engine shows signs of running too lean, the next flight
should be set richer. After a total of ten flights, the engine
should run continuously, on its optimum needle-valve
setting, without loss of power as it warms up.
4.
Now close the needle-valve until the engine speeds
up to "two-cycle"operation and allow it to run for
about 10 seconds, then reopen the needle-valve to
bring the engine back to "four-cycle"operation and
run it for another 10 seconds. Repeat this procedure
until the fuel tank is empty.
2.
Re-start and adjust the needle-valve so that the
engine just breaks into "two-cycle" from "four-cycle"
operation, then make three or four flights, avoiding
successive "nose-up" flights.
3.
MAX-25LA