[I_Am_Nous]

Now I'm imagining something like a fidget spinner combined with a Nuclear Pulse Engine[1] and it's awesome because I'm imagining that it can provide both propulsion and rotation...but I bet we need some great advances in material science before anything like it could exist.

1.https://en.wikipedia.org/wiki/Nuclear_pulse_propulsion

[adhesive_wombat]

I think it would be more like an enormous Wankel engine.

[I_Am_Nous]

A Wankel was what I thought of first, since it's the closest we've come to a rotational explosion engine, but I'm a space nerd so the combination of rotation and propulsion could make for some interesting applications related to space travel.