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Old 06-23-2007 | 09:08 PM
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doctorgo
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From: ypsilanti, MI
Default RE: Cermark Pitts Build/Assembly

Greetings, Randy.
I have always had wing incidence issues with biplanes. The GP 1/3 Pitts lower wing was way out of line and it was (I sold it) easily the worst flying plane of the 60 I built so far.

My GP Super Stearmans, on the other hand, are absolutely great! But again, the wing incidence was set wrong by design. I corrected it and the three I've done for myself and others, fly perfectly. The wing loading is 21.6 oz / sq ft, based upon its weight of 13 pounds, 12 ounces. With a Thunder Tiger 1.20 turning an APC 16 x 8 at 9200 rpm on 5% Wildcat fuel, it flies much too fast for scale. Obviously, a little less throttle remedies that situation.

In regard to the Cermark Pitts. I know the red model is an old Dave Patrick design. It was not well built at first and Dave's association with Cermark became strained years ago. The blue model looks a bit different than the red.

My question is: are the wing incidence specifications stated in the assembly manual? Does anyone know what they should be? The published specs indicate the model weighs 9-10 pounds. At 10 pounds the wing loading is 22.6 oz / sq ft. Do you consider 22.6 oz to be high?