[What's_nitro?]

I wonder, could you use the mouse trap to spin up a propeller attached to a flywheel so it would continue to provide some thrust after the string ran out? Or better yet, just use heavy, thin, large diameter, wheels. Mouse traps have quite a bit of torque so it would still achieve respectable velocities, and the wheels would store energy like a flywheel. You said you were allowed to use more than one trap, right?