Great Power Engine GP123 V2 Buku Petunjuk - Halaman 5
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Halaman Cetakare dangerous. Smoking near the fuel supply or engine can lead to serious consequences. Fuel must
be stored in an approved container in well-ventilated areas.
17. The engine temperature will be very high when/after running. Do not touch or refuel the engine
until it cools down.
18. Do not connect GP engines with RCEXL tachometers because they are incompatible and it could
cause damage to the ignition and engine.
19. Regular carbon steel screws are not strong enough for high horsepower engines. Therefore, M6×55
special alloy screws come with our GP178. They are special alloy (SNCM439)
tensile strength to prevent propeller screws from breaking during flights. M6×55 can only applied
on GP178 only.
20. Manually insert the propeller screws to a point where the threads of screw (MPT) and the threads
of hole (FPT) are properly engaged, before using an electric screwdriver to tighten the screws or it
may damage the MPT and FPT which might cause the propeller screws to break during flights.
CHOOSING A PROPELLER
Propellers of identical dimensions produced by different manufacturers tend to vary in
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performance. This can even be true when propellers are of the same dimensions and brands. It is
important to realize that environmental factors, such as temperature, atmospheric pressure, plane
weight, exhaust system, will affect propeller load.
In terms of materials, carbon fiber propellers usually produce higher RPM than wood propellers of
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the same diameters and pitches.
Never forget to balance your propeller because it is critical to your engine's health.
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Always use a drill press to drill your propeller at the back. Imprecise drilling is very likely to result
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in sheared propeller bolts. If you have difficulties in tightening the propeller bolts, it can be a sign
of imprecise drilling in the propeller. Only balanced and precisely drilled propeller can be used on
your engine.
It is not recommended using carbon fiber back plate and spinner together, as it may result in sheared
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propeller bolts. Only alloy back plate is recommended.
Ignorance of the above-listed instructions can lead to vibration in the unbalanced propeller, and
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therefore bearing damage and/or crankshaft twist.
SNCM439 is heat-treated alloy steel with tensile strength within a range of 950~1100 MPa. This grade has high hardenability and can
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be applied to high tensile steel sections.
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which has a better
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