United States. Army. Signal Corps · Washington · leaf 165
n other words, it is while flying forward at the same time moving sideways in the direction of M. In moving sideways the “keel surface” receives, of course, a pres- sure from the air equal and opposite to M. Since such surface is greatest in effect toward the tail then the latter must be pushed… … Fig. 77. still more. Such tilting tendency is, however, opposed by the dif- ference of the H. E.’s of the two wings. It then follows that for the lateral dihedral angle to be effective such' angle must be large enough to produce when the airplane tilts a dif- ference in the H. E.’s of the two…
Aeronautics, Military
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