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Hi basjoos,
You are correct about the NACA airfoils. When I was viewing these carefully about two years ago, I was specifically looking for those that were close to symmetrical in shape as possible.
As you pointed out, we are not looking for shapes that create lift, but rather shapes that allow a low Cd.
Mike, I'm still amazed that the Questair Venture can still keep the air attached at 350 mph with that sharp of an angle. Even the Bonneville Salt Flats land speed record motorcycles are much longer in shape, and they also get up to about 350 mph or so. In fact, if I recall correctly, the old Piper Cub airplanes have a longer tail than the Questar, and my Dad's cruised at about 65 knots.
Jim.
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