3 different hovercraft videos posted by my classmate

well today i watched some of the videos that my fellow classmates uploaded on their blog. some of them were just the exact ones i had but i didnt mind because i knew this would happen. after all i saw some videos dat i really liked but i could post them on my blog because they already had them but i still learned a little more from their videos than what i learned from mine. i saw some videos with some pretty good hovercraft but i still have some questions like how do they make it go in a single direction?, because they all go some form of way they dont ever just go in one direction but i saw some some competions in one video that one of my classmate had and it seems like it moves a lot but it only moves when he moves his body in some form of way.