shouldnoteatindat Posted December 31, 2013 Posted December 31, 2013 OK, so i wanted to know the size of the rocket required for different shell sizes. Anyone have a handy list?And the fuel would be 71/13/13 Kno3 , Charcoal , Sulfur.
Mortartube Posted December 31, 2013 Posted December 31, 2013 You would need to experiment. There is no one size fits all answer. Your BP may lift a particular sized rocket whereas somebody elses won't. Grain size, charcoal etc all make a difference to your rocket motor power as does choke size. I would suggest that you start off with a case about 3/4 inch I.D. The larger the rocket, the slower burning the mix in general as a larger surface area produces more gas.
MrB Posted January 2, 2014 Posted January 2, 2014 While there is no 1 size fits all answer to this question, there is a general guideline that keeps giving you a reasonable estimate of lift capacity. Rocket size / Payload2oz / 1/2oz4oz / 1 oz8 oz / 2-3oz1lb / 4-6oz2lb / 8-10oz3 lb / 12-14oz4 lb / 16oz6lb / 18-24oz I have very little testing to relate it to, generally i've been launching my stuff from mortars. But the above is supposedly as accurate as anything can be, when your KNO3 can be anything from fertilizer grade, to pure, your charcaol can be anything from undercooked hardwood to overcooked softwood, and your sulfur can be... Well, gardening supplies, or pure. It's at best ruff estimates, and you'll have to figure out exactly what your stuff is good for. Oh, and it's ONLY a reference for cored BP rockets. Anything else, and your all on your own again. (As if you weren't in the first place...)B!
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