As I've said before BALLS was great, making propellant is fun and the stuff I tested worked well, which could not be said for my rocket recovery. For some reason the charges didn't shear the shear pins and so the rocket came down in a flat spin and the entire body tube cracked up on landing, as spacks go this isn't too bad a one as the altimeter /
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I actually never thought about what one would actually need to propel a rocket. Though, I suppose you don't exactly fill up at the petrol station. :)
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It's definately one not to miss.
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