Scientific Method and Airplanes Flying Distance

For fun and experimenting, while most of the 5th grade class was on a field trip, the students still at school made paper airplanes and experimented with wing design to create a longer flight distance.  We flew the planes recorded distance and made changes to find the best distance. One student's plane flew 4 1/2' the first flight; she later had a flight of 42'.  Great use of scientific method!