Gliders by Design

I'm really impressed by this app. My teens are into airplanes and had a lot of fun building and flying the airplanes they designed. We all learn a lot about aerodynamics and airplane design in the process. You can learn as little or as much as you want. The airplanes are easy, quick and inexpensive to build. It was especially fun using the program to come up with different designs and fly them off against one another. Made us feel like we were real life airplane designers.