I've seen an airfoil/windtunnel online simulation somewhereon the NASA site, but can't find the link right now.A similar, even better online simulation called JavaFoilcan be found on Martin Hepperles site www.mh-aerotools.de.Hepperles site is good reading anyway, lots of interestingaero stuff, resource to dig in. However, I don't think any software can be close asconvincing as an even crude homemade education windtunnel.regardsAndre