Thanks guys. 3D is WAY WAY beyond me. I am a balsa and basswood and bondo and fiberglass type of guy. I was not aware of the fusion kit. 4" is a bit big for me and I doubt an F would fly it, not to mention the price for what WILL one day be plowing nose first into a field (my eventual luck with these things!!!) but I will contact them about the 3" they previously sold. Thanks again.