I use to have an rx-7 i took the engine out and ported it. That looks to be a single rotor engine the cars have two rotors. Looks cool though and i thought i was the first one to think of this. They use the regular 13b engine in light weight aircraft. Well a few changes but nothing major. The engines won't stall upside down also if you blow an apex seal in your engine you've only ruined half your motor and can continue flying ro driving. Again with new inventions they came out with ceramic seals that dont chew up your rotor housing which is chormed inside so the seals run smooth. They also have alloy seals that are 700x more flexiable and 700x stronger than stock seals. Oh if i had a million dollars.

O.K.