Date: 22 Feb 99 03:30:32 From: "P. Wezeman" <email@example.com> Organization: The University of Iowa References: 1 2 Followups: 1
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On 13 Feb 1999, Ken Ishiguro wrote: > 3. Wing incidence is the angle (viewed from the side) that the wing is > attached to the fuselage. In other words, if the leading edge were held > in one place and the trailing edge were moved up or down, the angle of > incidence would be changing. Obviously, most wings are securely bolted > to the fuselage, and the AI is fixed (except for the Boeing Tiltrotor). > An "all flying" horizontal tail would be an example where angle of > incidence is variable. On the Boeing Tiltrotor the wing incidence is fixed and the engines with their rotors tilt. There were earlier designs, some American, some Canadian, and perhaps one Japanese, where the entire wing tilted. The Vought Crusader carrier based fighter, still used with the French Navy until the naval version of the Rafale is operational, has a variable incidence wing. This allows it to increase wing incidence for landing and take-off while keeping the fuselage horizontal for good pilot visibility over the nose. The incidence changing mechanism was lighter than the longer landing gear needed without it to accommodate landing with nose up. The Martin XB-51 also had variable incidence. There is a homebuilt aircraft design, called I believe the FreeWing, that uses wings with variable incidence differentially for roll control, and collectively for lift control (you can't really say that the wings control pitch since the fuselage stays aligned with the relative wind). Peter Wezeman, anti-social Darwinist "Carpe Cyprinidae"