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INFLUENCE OF SWEEP ON Ct
Wing sweep is a major parameter affecting Gt. Consider the swept yawed wing illustrated in Fig. 8.10. According to simple sweep theory it is the velocity Vn normal to a wing reference line (J chord line for subsonic, l. e. for supersonic) that determines the lift. It follows obviously that the lift is greater
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Fig. 8.10 Dihedral effect of a swept wing. |
on the right half of the wing shown than on the left half, and hence that there is a negative rolling moment. The rolling moment would be expected for small (1 to be proportional to
tfiUJVWM – (K2)ien = 0хГ*[сов* (A — P) — cos2 (Л + /?)]
= 20 L(3 Vі sin 2Л
The proportionality with GL and (3 is correct, but the sin 2Л factor is not a good approximation to the variation with Л. The result is a oc CL, that can be calculated by the methods of linear wing theory.
