Re CAD: Don't waste your time with AutoCAD; it's pretty much obsolete (and discontinued by AutoDesk). Also if possible, don't waste your time with any 2D program; working in 3D is actually easier and a must for the kind of shapes you need for aircraft design. The "move up to 3D" advertising hype a lot of programs are using sets my teeth on edge as good affordable 3D for PC has been available for over 20 years now. The parametric history based modelers (Pro/E, Solidworks, Inventor, etc.) can be very powerful but IMO aren't the best tool when you're doing preliminary design and making significant changes as you go along. If you have the basic shape down and if you model it correctly from the start, changes can be very easy to make. However, the possible changes are limited by how you created the model in the first place, and you're very limited in what you can do imported files. Pro/E is probably the most complex of the bunch to use... not for the amateur. It's been some years since I used Rhino; it's a good surface modeler, but the drafting tools were kinda weak... I don't know what it's like today. My personal preference is KeyCreator (formerly Cadkey). It's what they call a "pure geometry" modeler, no worrying about parameters or history... you can make large sweeping changes regardless of how you started, even if the original design came from another CAD program. It has the best surface modeler around in its price class; there isn't a shape it can't handle (which can't be said for most parametric modeler). All of the above programs are in the $3-4000 range, but all have substrantial student discounts if you're eligible. -Dana A seminar on Time Travel will be held two weeks ago.