Aerodynamics is the way air flows around things. We briefly discussed two of the forces that have always kept airplanes in the air. Thrust propels the aircraft forward while drag simultaneously slows it down. We held our arms out and moved through the air with our palms out and then with palms facing down and noted the difference in air contact.
We made hovercrafts from used CDs, water bottle caps, and balloons. To limit drag, the CD needed to hover on a cushion of air as it floated across the table, while the releasing air from the balloon thrust the craft forward. We found flaws to our design that limited this and we brainstormed to find solutions to correct it.
And we did! Look!