hey how much faster did the rocket make you go
also you may not or may have heard of melting sugar and kno3 together to get more power you could try that in your rocket and try to put a better nozzle on it clay should work fine it is very heat restistant i have used it for my rockets
i think it is fine for u to be on the skate board at the same time as the rocket u just need to make sure the rocket design works first so test it a few times before u use it good luck and i want to see more videos of more test.
couldnt you get one of those old fire exinguishers with the shrader valves on em and and fill it up and attach it to ur back and pull the trigger and off you go sounds alot safer and cheaper
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