Yes, that is why I would think of a wing with a known stall angle per air speed and density. This angle would be found by turning the little wing-paddle until it lost lift. It would probably get you within the 15 knots you need even in tight spots. You'd have to know the AoA from other means to get the actual stall angle.
You would of course have to apply more and more torque to the axis to counteract the moment arm from impinging air. Maybe a strange cylindrical wing could be used.
Last edited by deSitter; 25th Jul 2012 at 01:51.