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Vibration when on Approach

props landing

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#1 borrisl

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  • Richard Lowe
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Posted 04 June 2018 - 04:02 AM

I've been flying the Varieze for a while now. It's been sitting since completion due to some concerns.

No matter what type of material the prop is made of, when landing and throttling back to around 1500 rpm, the craft vibrates from feedback of some sort from the prop windmilling into the air. My normal practice is to keep the rpm to 1800+ on approach. Is this common and is it a problem?



#2 Kent Ashton

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Posted 04 June 2018 - 07:36 AM

Never seen that myself but here are a couple of articles

http://www.epi-eng.c...tion_issues.htm

http://grahamshevlin...resolved?blog=3

 

This one had a good idea for watching the hub at the problem RPM

http://www.flight-me...ller-vibration/


-Kent
Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold


#3 borrisl

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Posted 04 June 2018 - 07:49 AM

Some good ideas. Might have to check indexing. On the IVO prop or Prince behavior was the same, which to me, rules out prop balance. What are the chances that both props are out of balance in the same way.







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