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3
Operating Limitations and Safety Advice
HELIX propellers are constructed for giving thrust to aircrafts with an engine output of
between 20 and 85 kW using 2-stroke, 4-stroke, rotary- or electric engines.
The operating limitations for the here described propeller types of H50F as 2-, 3- and
4-blade-Version in clockwise and anti-clockwise rotation are for diameters from 1,45m to
2,20m.
There is to distinguish:
For propeller of airfoil-series C, N, and S:
− Maximum propeller-rpm: 2.500 rpm
− Maximum engine power: 85 kW
For propeller of airfoil-series CI, CS, LS, TS and SI:
− Maximum propeller-rpm: 3.400 rpm
− Maximum engine power: 85 kW
Warning:
If the maximum operating values are exceeded the propeller, engine or gearbox may be
damaged. If the propeller becomes damaged its balance will be affected which can cause
failure of the engine mountings.
Before starting the engine, the pilot must ensure that the area around the propeller is clear
to avoid any risk of accident by fly-away objects. The entire area of the rotation plane is
generally avoided because of the risk of accidents by radially ejected parts.
The engine can only be hand started by qualified personnel. The hard edges of the
propeller can cause severe injury if the engine starts too fast as the blades beat back.
Manual H50F
Ausgabe 15.01.2016
Seite 6 / 11
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