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Testing for Resonant Harmonics

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Daleandee

Well-Known Member
Joined
Sep 11, 2015
Messages
2,391
Location
SC
Keep in mind that I'm the uneducated one here so please be gentle. I read the quote below on another forum and found it interesting:

"They started it up at night and put a standard automotive timing strobe light pointed at the prop and running off of one spark plug. The prop was appearing stationary and solid until they got up to the normal full power climb RPM range of 2500-2700. Then the prop started hopping around with each strobe pulse. This was entirely due to resonant harmonics being amplified."

This quote is from a post on the Jabiru Groups io site: Re: Low RPM

Don't know if you have to be a member to see the entire post but wanted to give credit to the source.

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