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Propeller Orientation

DHeal

DHeal

Well Known Member
A quick question for our prop gurus: When installing the stock two-blade Sensenich prop on the 912, is the prop's radial orientation with respect to the prop flange of any consequence? For example, is there any potential benefit in "re-clocking" the prop installation on a 912 engine to address a slight perceived prop imbalance/vibration?

With the 912's gearing, it would seem that re-clocking the prop might not affect the prop/engine harmonics the way it does on direct-drive engines??
 
DHeal said:
A quick question for our prop gurus: When installing the stock two-blade Sensenich prop on the 912, is the prop's radial orientation with respect to the prop flange of any consequence? For example, is there any potential benefit in "re-clocking" the prop installation on a 912 engine to address a slight perceived prop imbalance/vibration?

With the 912's gearing, it would seem that re-clocking the prop might not affect the prop/engine harmonics the way it does on direct-drive engines??
Click to expand...

I would think that with a PSRU ratio of 2.41-to-1, a very non-integer ratio, that whatever orientation between engine and propeller relative positions will change continually....It were a fixed simple ratio(2:1/3:1, etc, you would maybe have something to seriously wonder about.
 
Just had my prop dynamically balanced a couple of days ago. It was so close he only added a #6 and a #4 screw on the backing plate. Hardly seemed wrth the money, but he did get the vibration down from 0.12 IPS to 0.05 IPS.
 
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