Mousetrap car

If not there isn't much else I can think of. Is that the design that was given to you by a teacher or something? How does it run? Is it smooth and just not very far or is it bumpy/gets stuck?

This was a design that I came up with (within my teacher's limitations). The runs are very sporadic; sometimes it doesn't go at all, most of the time it goes ~1 meter, and rarely it goes to around 3. The car runs smoothy; the only problem I see is that my technique of winding may not be the best way of setting the car up.