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  1. D

    I want to use the wind to move a flap, and thought you folks might be able to advise

    Imagine a small (2-3 inches) device shaped something like a light-weight house-door hinge, with little friction, supported by the (vertical) hinge pin and held open to a 90 degree angle by a very light spring. I'd like to have it blow closed (0 degree angle) when there's a wind greater than say...
  2. M

    Retrofit Trimming (Strong pitch trim)

    Hello from Germany, Since I have received my sport pilot license in 2009 I have been thinking about various building projects (CH701, Asso V, ULF2) and finally got stuck with the SD-1 by Igor Spacek. Everything is quite regulated over here so we are still awaiting final certification of the...
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