"No matter what anyone tells you, EVERY paper airplane needs fine-tuning to achieve its best performance. There are several things you should keep in mind while making adjustments to your planes. "
"Download any of the free paper airplane designs below and get flying!
Just print out the template onto standard 8.5" X 11" printer paper. The fold and cut lines are clearly printed right onto the template, and each paper airplane design has easy-to-follow instructions. Make sure to read the printing tips at the bottom of this page. Also see the Flying Tips page for information about how to get the best performance out of your models. "
"Students construct balloon-powered racing cars using a foam tray and drinking straws. They then test the cars along a measured track on the floor. At the conclusion of the activity, students submit a detailed report on their racer design and how it performed in the trials."