Mindphreak Posted June 26, 2009 Share Posted June 26, 2009 Alright, so I've had some good bp rockets as well as bad using different nozzel hole widths. As a question, what is the reccomended (starting point) width of the hole? I read 1/2 the I.D. somewhere but that does not seem quite right, as the holes look too big. Also, if my I.D. is X centimeters, should my nozzle extend X centimeters into the rocket?Lastly, if my bp is already powdered, how long should I mill it for before using it in a rocket? I know rocket grade bp is low, but should 2 hours work? I want to develope consistant results with these rockets.Thanks for your help, I had trouble finding the exact nozzle dimensions. Link to comment Share on other sites More sharing options...
Mumbles Posted June 26, 2009 Share Posted June 26, 2009 Core burners generally start a 1/3 ID, and core burners at 1/4 ID. The nozzle should be 3/4 to 1 ID thick. Most people don't mill the comp for core burners, and for end burners, I'd recomend making with whatever your normal lifting/bursting BP is. Link to comment Share on other sites More sharing options...
Mindphreak Posted June 26, 2009 Author Share Posted June 26, 2009 Core burners generally start a 1/3 ID, and core burners at 1/4 ID. Alright that works. In your first sentence did you mean end burners? Link to comment Share on other sites More sharing options...
Mumbles Posted June 26, 2009 Share Posted June 26, 2009 Opps, I mistyped. Core burners start at 1/3 ID, END burners at 1/4 ID. Link to comment Share on other sites More sharing options...
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