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  1. C

    Curtiss Model 203 Quad Tiltrotor

    A few years ago I bought a book on Curtiss Tiltrotors. Lots of good info, pictures and drawings. I used the drawings of the Model 203 to create a CAD file with the idea of making a 3D printed set of parts.What I was wondering is if anyone has any suggestions as to what would make a good scale to...