Quote:
Originally Posted by Richard Wallace
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Hi Richard. Thanks for the link.
The calculator is based on that paper, which is in turn based on
Morrison's paper.
Morrison's paper is wrong, I believe. His derivation for the force Fx is incorrect. He goes off the rails at Equation 12 where he says Fx is equal to Fd.
... Fx is equal to Fd only for the special case when the velocity V is horizontal.
For the general case when V is not horizontal, Fx is the sum of components from Fd and Fl, as follows:
Fx = Fd*(Vx/V) - Fl*(Vy/V)