By Alfred Lande
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Extra info for The Physics of Flight
The part inside the body is called the "bound part" of the vortex line A BCD A. The air not only circulates about the free parts but about the bound part as well, so that any closed chain c inside the fluid which cannot be stripped off the vortex AB the same circulation value T, no matter whether the chain drawn around the free or the bound part of the vortex line. line yields is Fig. 26 gives a top view of the actual situation near and behind a wing, A B, surrounded by air circulation, when the wing moves to the left or when the wind blows to the right.
P. Although the has this the wing usually characteristic, airplane as a whole is stabilized against cumulative a-increase by the counter-torque of the increase of a. itself horizontal tail surface. p. reaches its maximum forward position at a certain definite angle of attack. A further increase of a. p. p. at a certain angle of attack was defined as the point about which the wind torque vanishes. The torque about other points of the chord at the same a, does not vanish. Of particular interest is the torque about the leading edge of the wing, called pitching moment, and denoted by the letter The value of depends on a.
Wings are sometimes given a slight twist so as to reduce the wing pressure near the tips. The spa-Uj distance from one wing tip to the other is defined as the wing by the letter b and measured in feet. Wing usually denoted spans range from 30 feet in small trainers (compare with Da Vinci's human bird (section 1), to 212 feet in the giant Douglas B-19 bomber. A vertical cross-section through the wing shows the profile with its blunt leading edge and sharp trailing edge. The distance from the leading to the trailing edge is defined as the wing chord and is denoted by the letter c.
The Physics of Flight by Alfred Lande