This Vortex Generator device allows various diameters and lengths of pipe to be interchanged while spining the air and fuel vapor into the Joe Pipe. Can be designed to mount on a tripot for your demonstration project.
Tobu Zoo's Mount Rocky Coaster. Demolished to make way for "Kawasemi". This ride's manufacturer went bankrupt in 2003, according to RCDB.com, and I've read that the ride needed spare parts, but they couldn't be found since the manufacturer was gone.
sorry for bad camera angle. i'm too cheap to buy an actual camera mount for my bike so i duct tape my camera to windshield. hopefully i do a better job next time, lol. but anyways this is me out cruising around