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I have checked the rudder alignment and they are spot on. Set identically to the way the old rudders were. Old rudders...no hum, new rudders....hum like h***!

I did find this in my search:

http://www.ahpc.com.au/pdf/Noisy%20Foils.pdf


What about the trailing edge, did you malke a small about 1/8" flat spot. Most people use a pair of scissors.

Doug