I've written an Excel Spreadsheet that will calculate the MAC, NP, Static Margin and more with a Tutorial on how to use it written for Radio Controlled Soaring Digest (RCSD).

All I've done is to take formulas from Martin Simons, Mark Drela and DJ Aerotech and placed into an easy to use spreadsheet.

It's available FREE at www.TailwindGliders.com

Curtis
12" of Snow in Montana but I guess it's only April!