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Operating Instructions
Combustion Engine „Force 36"
Prescribed use
The highly developed combustion engine you purchased is intended to be used in suitable
models. Please observe the following safety instructions and danger warnings.
All company names and product designations contained herein are trademarks of the
respective owners. All rights are reserved.
General information
Dear customer, the following operating manual gives notes and information on the operation
of the engine.
Combustion engines for models are a powerful alternative to electric motors if the much louder
operating noise and the exhaust fumes do not matter in model operation.
They are, however, not so easy to handle and require special treatment before, during
and after operation. In the case of wrong treatment, the engine has a low power output,
does not run correctly, or is inoperative after only a short runtime (please bear in mind
that improper operation leads to loss of guarantee/warranty!)
As a matter of course, these operating instructions cannot impart any practical
knowledge. If you have never worked with a combustion engine, we recommend joining
a model construction club in your area.
There, you will surely find help for the first steps to a successful handling of model combustion
engines.
Safety instructions
We do not assume liability for damage to property or personal injury
caused by improper use or the failure to observe the safety instructions.
The guarantee will expire in any such case.
Depending on the engine type and the respective model in which it is installed
(airplane, car or ship model), some of the following safety instructions might not
apply.
Keep the product out of reach of children. It is not a toy; it should be kept out of
reach of children under 14 years of age!
Before each start, ensure the safe operation of your model and of the engine.
Even normal engine vibrations can lead to the loosening of the engine and other
drive parts. Therefore, check if the engine and all drive parts sit correctly prior to
each new starting of the engine.
We recommend an appropriate liability insurance for the operation of models. A
model airplane crash or an accident with a model car might cause serious
personal or property damage. Ask your insurance agent for further information,
if the operation of the model is covered by the insurance or not.
Perhaps, a liability insurance is already included in the contributions for a model
construction club.
Never operate the engine in closed rooms. The fumes are poisonous!
If the engine is operated outside the model, a suitable test stand is to be used.
Keep children and spectators away from running engines.
For starting the engine, use a suitable starter or finger protection (airplane
models with propeller). Some engines allow a comfortable start with a so-called
pull starter.
Engine and sound absorber become very hot during operation. Risk of burns!
To stop the engine, interrupt the fuel supply or close the carburettor tap.
Never try to stop a running engine with your fingers. Risk of severe injuries!
Item no. 23 71 93
With airplane models with a propeller, never stand in front of or next to the engine/
propeller; there is a high risk of injury! Setting and adjustment work must be
carried out from the rear!
Make sure that no fuel leaks in an uncontrollable way during the operation of the
engine; risk of fire, explosion and burns!
Never hold any objects into moving drive parts (e.g. propeller). Do not block the
engine.
Propellers must not be repaired. Damaged propellers must be replaced!
The transmitter and receiver must be left switched on as long as the engine is
running in order to keep the model and the engine under control at any time.
Do not try to experiment with your engine. Seek the advice of an experienced
modeller or let the latter help you with the assembly.
Do not leave packaging material unattended. It may become a dangerous toy for
children.
Mounting the engine
The engine must be fastened firmly and free of oscillation on a stable engine support
(preferably made of aluminium). To that effect, use sufficiently dimensioned screw bolts and
secured screw nuts. The engine should be plane with the clamping surface so that the motor
flange cannot distort.
Adjusting the carburettor
In general, carburettors are equipped with two independent adjustable needles. The first
needle, the full throttle needle, is located directly at the fuel connection. With this needle, the
full throttle run is adjusted.
When the needle is unscrewed, the engine is supplied with more fuel. This is called a rich
carburettor setting. When the needle is screwed into the nozzle connection, the flow cross
section is reduced and the engine is supplied with less fuel. This is called a lean carburettor
setting.
The second needle is the idle speed needle. With some airplane engines, for example, the
idle speed needle is located opposite to the full throttle needle on the other side of the
carburettor. With this needle, not only the idle speed but also the transition from idle speed to
full throttle is adjusted.
As with the full throttle needle, the air mixture is made leaner by screwing in the needle. When
the needle is unscrewed, a richer setting is achieved. The full throttle needle is to be opened
by approx. 2–3 turns. The same is to be done with the idle speed needle.
If the tip of the idle speed needle is visible through the open carburettor, the needle is to be
set in such a way that the tip of the needle starts to immerse in the counter cone when the
carburettor is half closed.
The engine can be started with the carburettor being opened by ¼. After the warming-up, the
full throttle is adjusted. The highest engine speed is adjusted by screwing in the full throttle
needle, with the carburettor being opened completely. As the engine becomes weaker during
operation, you should now unscrew the full throttle needle slightly on the "richer" side.
A too lean idle speed setting causes the engine to stop when throttling the engine or
accelerating. If the engine becomes slower in idle speed until it stops, or if it accelerates only
reluctantly, this means that the idle speed setting is too rich and must be made leaner.
Modifications to the needle must only be carried out in small steps; this applies especially to
the idle speed needle. Taking an analogue watch as an example, an adjustment by "5 minutes"
can already be too much.
A correctly set engine will always run smoothly, also at longer idle speed running times, and
will accept the throttle promptly.
If you have no experience with model combustion engines at all, we recommend the help of
an experienced modeller. You can thus prevent not only lengthy (unsuccessful) trying but also
a damaging of the expensive engine.
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