Here’s one way to handle the long chord section:Getting back to the Sig Wonder planform, I wonder if anyone has any ideas on how to manage two possibly-related issues: the sharp transition between the short- and long-chord wing sections and potentially poor stall behavior.
I don’t think I’d plan on having that ducktail in the middle contribute to any lift at all. In fact, I see it as either an exceptionally short coupled horizontal stabilizer or if you prefer as a reflexed extension of the trailing edge. In either case it ought to allow a little more forgiving (of builder error) airfoil to be used for the balance of the wing.the plane would always need to be balanced fairly far forward.
The FLying Wing Stunt is a Control line bird so stability might be differentAnother similar one to what is proposed but a little more rounded:
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The Sig Wonder looks too much like a simplified discredited Rans S11, that didn’t end well and was never resurrected