[Petronski]

No engine. Just like walking is a "controlled fall", this thing is actually powered by the force of gravity produced by leaning the way you want to go.

Wow, would I love to believe that! But then, like CCR said, 'we can ponder perpetual motion,' that doesn't mean we get anything done.

[bayourod]

Remember that SLINKY toy that looked like a big flimsy spring and would "walk" down stairs? Think of adding gyros to one of them and replacing the gravity created by going down stairs by the gravity force created when you are falling over.

A person falling over creates a lot of force. Have you ever tried to catch a person falling over?

The gyros won't permit the person to fall, therefore that force has to be directed somewhere and apparently it is directed toward forward(or backward) motion revolution of the wheels.

Fat people moght be able to go faster than thin people.

It could become a new Olympic event.