MVVS 175 NP 3012, Руководство по эксплуатации

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12) Always stop the engine either by turning off the ignition switch or by completely
closing the carburetor throttle valve.
13) Before starting the engine always make sure that the model is safely fixed in place and
cannot start moving.
14) Fuel is combustible and therefore must be kept in an enclosed container at a safe
distance from the engine when it is running.
15) When preparing fuel carefully follow the manufacturer’s or dealer’s instructions.
16) Small objects must be kept at a safe distance from the engine when it is running. Never
throw any objects towards the spinning propeller.
17) Be careful in choosing the location where you wish to start the engine. Avoid dusty or
sandy areas.
18) Start the engine in well-ventilated areas only. Never start the engine indoors.
19) When starting the engine make sure that bystanders, especially children, are at a safe
distance of at least 10 m.
20) The engine power output makes it possible to fly big models. Mal-operation of such
models may cause serious damage. Start using the MVVS 175cc in model planes only
after you have mastered operating smaller models.
Selecting a suitable propeller
It is usually the case that propellers of the same dimensions coming from different
manufacturers are not the same. Oftentimes not even propellers of the same dimensions
produced by a same manufacturer are not the same. The engine power is best utilized when
the propeller dynamics curve and engine power curve (revolutions/power output) intersect in
the area of the engine top power output. Unfortunately, no propeller manufacturer provides
this information. Engine power output is also a variable quality. It depends above all on the
silencer used and can considerably vary. The situation is further complicated by
environmental parameters (temperature and atmospheric pressure in particular): low
temperature and high pressure increase propellers’ input requirements by 20% in
comparison with input at hot weather.
Suggested propeller dimensions:
two-blade: 32x10, 31x12, 32x12
three blade: 29x12, 30x13
These values are only approximate and may vary with the factors described in the previous
section, as well as with the type of the exhaust system used.
The MVVS 175 is designed for the power maximum by 5800 – 6300 RPM (according the
exhaust pipe used). If this maximum performance is needed, choose the suitable propeller
so, the engine reach these speed on the ground (in fact slightly lower; depends on the
unloading the propeller in air in accordance to reached speed while flying).
We do not recommend using propellers, which allow turning the engine on the ground more
as 7000 RpM.