An example opposite the prismatic body would be the
GM EV-1. The cabin appears too steep, but the generous taper in plan compensates.
Consider also the
Gurney flap or wickerbill.
Quote:
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The device operates by increasing pressure on the pressure side, decreasing pressure on the suction side, and helping the boundary layer flow stay attached all the way to the trailing edge on the suction side of the airfoil.[4] Common applications occur in auto racing, helicopter horizontal stabilizers, and aircraft where high lift is essential, such as banner-towing airplanes.[5]
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It does what I think you want the spoiler to do, on a smaller scale.