Influence of Wing and Fuselage on the Vertical-tail Contribution to the Low-speed Rolling Derivatives of Midwing Airplane Models with 45 Degree Sweptback Surfaces

Abstract : An investigation was made to determine the influence of the wing and fuselage on the vertical-tail contribution to the low-speed rolling derivatives of midwing airplane models with 45 deg sweptback surfaces. The results show that the vertical-tail contribution to the rolling derivatives of midwing or near-midwing configurations can be calculated with good accuracy throughout the angle-of-attack range by using available procedures when corrections have been made for the effects of fuselage and wing sidewash at the tail due to roll. The mutual wing-fuselage interference increments of the wing-fuselage configurations investigated showed no consistent effect of fuselage length. The increments were usually rather small and did not vary appreciably with angle of attack except that the increment in yawing moment due to rolling became quite large at angles of attack above 160. The contribution of the fuselage alone to the rolling derivatives was small in comparison with the effects of angle of attack for the other components of the models investigated.