Most of the air crafts were made out of balloons, and some were made out of paper. One was even made out of wood. I thought Zack's air craft was unique because it was powered by hand. He had to spin the stick which would power the propeller to create lift. I also thought George's presentation was cool because he had a big bag and he put hot air into the bag. When he let go the balloon went up, because the hot air created lift (when it expands). And then it came down when the hot air was released and cooled down.
What I learned in this unit of flight was making aircraft is not that easy. You have to make sure that every thing is properly made so that the four forces of flight are all balanced. I enjoyed this unit because we got to do a lot of experiments that were fun. My question for you all is