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They must've had to mount that ramp on the truck pretty securely, or Bernoulli's Principle would make it act like an airplane wing and lift it up.
No, the bottom of the ramp is flat, so the air there stays still for the most part, with the bottom of the ramp just moving over it, while the air has to move up and over on top of the ramp. Though I still don't get how stunt planes can fly upside down, wouldn't a reverse-Bernoulli effect occur, pushing the plane down?