Propeller Weight
Is there a maximum recommended prop weight for Rotax 912ULS?
Is there a maximum recommended prop weight for Rotax 912ULS?
by Bill Hertzel » 11 months ago
There is no weight limit but there are Moment of Inertia (M of I) limits.
The Prop acts like a flywheel to smooth out the engine.
It can also be too small, but not likely.
912 Installation Manual, Chapter 61-00-00 Page 4,
System Limitations
Moment of Inertia
... between1500 kg cm^2 (3.5 lb ft^2) and 6000 kg cm^2 (14.2 lb ft^2).
The M of I of your prop will be specified by the manufacturer.
So, a Smaller Heavy prop might be OK, whereas a Larger, Lighter one might not.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
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by Sean Griffin » 11 months ago
I have reviewed my propeller specifications - claimed Moment of Inertia ~0.5kgm^2
by Jim Isaacs » 11 months ago
Sean,
0.5 kg.cm^2? My Whirlwind GA RW3B is 4150 kg.cm^2
by Jeff B » 11 months ago
You guys are working in different units. Sean stated his prop MOI in kg/m^2, whereas Jim is stating in kg/cm^2. The conversion is 1 kg/m^2 = 10,000 kg/cm^2. So at .5 kg/m^2, Sean’s propeller is 5000 kg/cm^2. He is good to go.
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