Tiro, I think this Swiss approach complements McDRAG quite nicely for circular-arc head-shapes, but they do different things, though. McDRAG is OK for estimating CD0 (plus some CDa thrown in), and the Swiss paper at least attempts estimating CMa (but crudely). The new estimation of Iy/Ix available is the best I have seen and much needed for our CWAJ and Spin-Drift calculations. Gustavo will be pleased with this upgrade.Excellent!
Jim, what's your opinion of this calculator based on the "McDrag" program?