A tandem wing aircraft usually involves two full-sized wings, both of which are full airfoils. Sometimes an aircraft of this configuration can look like a variation on the biplane, but is in fact very different. The forward wing is often technically a canard, fitted with elevators, but both forward and aft wings provide lift. In the case of the QAC Quickie the design has no horizontal stabilizer, as all pitch control comes from the forward wing.
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