Abstract
The aerodynamic characteristics of a hemi-circular wing-in-ground are studied analytically. The exact expression of a spanwise optimum normal force distribution and the minimum induced drag are obtained from Trefftz plane flow field analysis, where Söhngen’s inversion integral formula and the elliptic integrals and Jacobian elliptic functions are used. The minimum induced drag obtained in the present study is coincident with that of Mamada and Ando.
