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I've had alot of experience with attaching rocket engines to toy cars. From my child hood.
I mostly used Stompers, which are larger than bits, and plastic, so from that experience I can tell you, if you attach a model rocket to your car, it will get airborn, your car will melt, and it will be spectacular fun. Even if you just use a bottle rocket. You might as well use a bottle rocket, because then you would at least have the cool explosion at the end.
If you do use a model rocket engine, you better attach some kind of fins for guidance, or you just better start running when you ignite that engine, because you wont know which way it's going to go. It'll probably spin wildly. Maybe put some lead weights in the car to keep it on the ground. and make some kind of airplane like rudder, to steer it, and you might be in business.
I'll agree with Hatchet_Dan. Wish I had videos of some of my little "projects" that I did when I was a kid. You know if you make a line of gunpowder, and put a big pile at the end, it doesn't go all slow like in the Roadrunner cartoons? My friend burned off his eyebrows, and I got lucky.
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