Troy,

Here is a review describing it. http://www.upperspace.com/press/ModelCAD.pdf I got an original ModelCAD version over 10 years ago, and it has been invaluable to me, as I prefer to scratch build all my planes. One of the programs in the set, Model Calc, lets me input the key parameters of an aircraft and then tells where the CG should be. I have already used it with estimates of size from Mike's Tempest pictures, and I know just where to put the CG. The WingMaster program draws the ribs or foam cutting templates for me. http://www.upperspace.com should take you to an offer to download a free trial copy. The latest version still works with DOS files I made of planes 10 years ago!

Robert