I have no idea what this can be used for, but it's intriguing, and is just wheels interacting with wheels, basically a gear multiplication

 

taking off from Palomar Airport, flying down the coast over San Diego, in an ultralight (once he's in the air, change your video speed to 2x, and turn the audio way down)

a walk through of a Martin Mars flying boat, then take off and landing (amazing interior, but not as cool a video as the next on of a Grumman Goose)

it's been a while since I've posted a video about flying a plane... and this video is thorough about looking over a Grumman Goose and flying it, and then doing that thing most airplanes can't - landing on water. Very very cool video

 

testing the urban legend about bologna on the paint, as a revenge method