Algodoo

COURSE
Started off as a course for my first simple hovercar, now reworked as a playground for aircraft. Has a lot more alternate paths and optional obstacles to test things over. Accommodates aircraft, hovercraft, really uber high-speed offroaders, and hybrid vehicles pretty well. White objects have zero friction; might need to change them if you want to test a ground vehicle, but it`s not impossible to get over them with some momentum or possibly treads.

VEHICLE
More tweaking and I rebuilt the balance for the fans` high airfriction. Now it`s much less chaotic and easier to tweak; all you need to do is scale or stretch the purple grids to change its vertical and horizontal aerodynamics. I think this grid is a really big advance for hacked superfans. The machine can lift about three times its weight and fly pretty reliably with the black 2X weight attached by a spring. It`s perhaps a bit faster now, too, accelerates faster, and loses less speed while turning. Stops pretty fast, and you can take the fans off autobrake (center hinges on the big green wheels) if you prefer coasting, but a lot of coasting distance was sacrificed for power.
Controls: UP and DOWN for the thrusters, LEFT and RIGHT to turn.