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What is a good design for an efficient inertia driven vehicle?

I need any kind of small contraption driven by inertia, it must weigh less than 500 grams and must be powered solely by an inertia driven mechanism. No springs or catapults or anything else allowed, needs to travel fast and far. Thanks It can't have a flywheel. It can only have rubber bands and floating weight to drive it.

Public Comments

1. It has to store its energy in flywheels. As much of that 500g as you can get away with should be a flywheel with as big a moment of inertia as possible, so it should be like a big ring.