Prop singing - as it's referred to in the prop industry occurs when the leading edge of the prop is dulled to a blunt surface and not a 45 degree surface. Thanks for challenging me on this. I was able to find information on line and now the props are at the prop shop for a tune up.
The prop shop owner asked if the noise sounds like a person taking a wet figure around a crystal wine glass - and there it was! Thanks all.
JimL
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