"The “tidal wave” planet in Interstellar is theoretically possible due to the rapid rotation of the planet. "
#26 That's because it's a kid's movie and parents have to buy a ticket, too, which account for more ticket sales and thus higher revenues.
Search for vespa 150 tap. It technically did work, but they were discontinued after a few years.
It actually made into combat and worked just fine, but aiming it was difficult. Only 600 were made, at only $500 USD a pop.