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4
Operating Limitations
HELIX Propellers are constructed for giving thrust to aircrafts with an engine output of
between 1 and 100 kW using 2-stroke, 4-stroke, rotary- or electric engine.
The operating limitations for the here described propeller types of H25F as 2-, 3- and
4-Blade-Version in clockwise and anti-clockwise rotation are for diameters from <1,00m
to 1,40m.
There is to distinguish:
For propeller of size from 1,00m - 1,25m:
- Maximum propeller-rpm: 3.000 rpm
- Maximum engine power: 10 kW
- In version A5 or A6: 25 kW
For propeller of size from 1,30m - 1,40m:
- Maximum propeller-rpm: 2.800 rpm
- Maximum engine power: 10 kW
- In version A5 or A6: 25 kW
For propeller of size from 1,50m - 1,80m:
- Maximum propeller-rpm: 2.200 rpm
- Maximum engine power: 10 kW
- In version A5 or A6: 25 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 free
from debris to avoid any impacts on the blades by foreign objects.
The engine can only be hand started by qualified personnel.
Manual H25F
Ausgabe 13.11.2018
page 6 / 10
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