- Sep 17, 2008
I've many times pointed that out on forums. I measured the chordline angle on our Citabrias in the three-point ground attitude, and found them at 12 degrees. Those wings stall at around 17 degrees, so the airplane, flaring to three-point attitude a few inches above the runway and travelling roughly parallel to the surface, has the wing at around 12 degrees, far short of stall. So we cannot call these "full-stall" landings. Trikes are similarly built; you bang the tail on the runway before you get to stall angle. The manufacturers designed their airplanes this way on purpose; you don't want the airplane stalling a couple of feet up, with attendant wing and nose drop. Could get ugly.1. In regular configuration, a 3-point landing is still at a higher speed than level stall speed. In other words, a normal 3-point does not approach the stall angle of attack because the tail wheel hits first. That is supported by noting that you can take off in a 3-point attitude, so obviously the wing is not stalled at that angle.
Besides that, at altitude there is upflow ahead of the leading edge that tends to increase actual AoA a little. In ground effect that upflow is damped, reducing the effective AoA a small amount.