Ammonium Perchlorate composite propellant rocket static test

[Spaceboundrocket]

so what is the process in making the fuel?

thanks

[jointtwo]

what is HTPB ?

is it it the expoxy?

[Vaslop2000]

thats very usefull, thanks. and what dimentions do people use for the length of core diameter of nozzle? i can do black powder rockets but these are a whole new beast! where could i buy some HTPB (in the UK, or that ship here)

[psycodogincali]

nice burn what are u usin 4 a nozzle? seemed to hold up well

[jmontello1]

@psycodogincali thanks, I used EDM grade graphite. It gives very repeatable performance

[psycodogincali]

@jmontello1 i also have been using epoxy i get good results lots of chuffers though my epoxy % is much higher 19-22 % .not sure where to get htpb or graphite but ive had some success using anchoring cement very solid when dry and moldable

[Vaslop2000]

nice!! what dimentions did you use? my composite rockets just explode! (partially detonate im sure, becuase its so loud and fuel is still left in the debris) I use 66 NH4NO3, 18 -250 # Al flake, 12 epoxy, 2% CuO.

[jmontello1]

@Vaslop2000 thanks, copper is a very powerful catalyst and is causing your burn rate exponent to be too high, use iron 3 oxide instead. I prefer atomized aluminum to flake in rocket fuels, I use 400 mesh. Try 82% AP, 2% Al and 16% HTPB. I got that mixture from a professional and it burns very stable on its own (much colder burn but similar performance). Try a Kn of 200. Buy HTPB, its cheaper and better than epoxy.

[Warlockofhell]

meh, solid rocket fuel has such a limited power. Try making something liquid, then you'll have some fun, thats what finally did, hard but worth it.

[pyrotechaholic]

NICE!!!!

[STBF1337]

Bloody hell this rocks :)

[KiwiTheDefenestrated]

Impressive.