There is an interesting and potentially useful property to do with the procession of Gyroscopes, as well as devices like the "Powerball" toy.
When the gyroscope is rotating (Ws) and then force is applied to increase the procession (Wp) the Ws rotation increases.
Experiments with the Powerball show that a small increase in Wp results in a very large increase in both Ws and the resistance to an increase of rotational velocity in Wp.
More intuitively, imagine the dynamics here as being like a variable gear that increases in gear ratio at an accelerating rate as the speed of the input increases.
Would it be practical to design a vehicle such as a human powered bike or a motorised car that used this property of a gyroscope instead of a conventional gearing system.