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There are three approaches to this need. First, you could build what amounts to a tandem wing. If you check the CoG location for a Rutan Quickie or its many derivatives, I'm pretty sure you'll find it's between the front (lower) and rear (upper) wings. Likewise, a Flying Flea (aka Pou de Ciel) has the CoG much further aft, relative to the forward/upper ...

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