the car in the vid is a tether car.......nothing realy fancy but this is still done here at flying field here 1 day a week...........a wire is attatched to a pole with a swivel so it dont wrap itself around the pole and the other end hooks to the side of the bridle on the car which is similar to the bridle on a kite.......the nitro engines are direct drive to the rear wheels........after everything is hooked up, they fuel up, push the car to get it started & let it go...........round & round, faster & faster it goes till it runs empty.........all they do is to see what they can do to the cars to get more speed than the rest & thats about it.........they did a dimo once on what the wire can do to a leg i thought was neat.........this one oldtimer had built a tether car that did 193mph, let it get up to speed & tossed a ham in there.......outch !! the wire cut the ham into........it was a small ham with the bone........