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Old February 11th 19, 02:38 PM posted to rec.aviation.soaring
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Default Problem with Grob-103

Between the speedup and pitchdown, there's a growling noise.
Don't think it was the pilot.

I've heard vibrating mylars, but this pitch is too low.
Maybe a bi-stable one?

I wonder if you could get enough 75Knot air with a garden blower in the shop.