Without flaps the rolling moment due to yaw of both wings (for β > 0) is positive, the leading wing is raised, the yawing moment due to yaw negative (restoring). A comparison of the straight trapezoidal wing with the corresponding straight rectangular wing indicates that the magnitude of the moments is reduced by the taper, as stipulated by theory;the agreement is also good quantitatively. The magnitude of the rolling moments due to yaw and of the yawing moments due to yaw is substantially increased by the sweepback;this effect is likewise reproduced satisfactorily by the theory.
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