In this report is clearified the relation between the lift coefficient and the dihedral angle of the main-wing and the vertical tail plane for a airplane given a shape of the fuselage and a plane form of the main-wing, to be able to turn steadily at a small bank angle and with all control surfaces fixed. Here we considered the balancing of the moments of air forces about the vertical axis and longitudinal axis. In this consideration for simplicity the air forces are assumed two-dimensional. From this relation the suitable values of the dihedral angle and the vertical tail plane area and position of the airplane to be designed, will be evaluated rather simply, by refering to these values of many excellent airplanes already in practical service.
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