jaysgoh Posted March 11, 2013 Posted March 11, 2013 i saw youtube there is a 16 years old is who studying chemistry and took the chemical make some bp and h3 .. guys .. if i use perchlorate and charcoal .. can i use for lift charge ? The Youtube using Bitter Bean its so slow ... basically h3 aND BP which is more important ? Using Balsa Charcoal
BlastFromThePast Posted March 11, 2013 Posted March 11, 2013 (edited) From my own experience Kperc and charcoal is not a very fast burning comp. As you mentioned, charcoal and Kchlorate (H3) is much faster. I beleive perc and charcoal is a comp called KP. Mumbles made a point of mentioning to me when I was trying to make KP that it works well as a burst for 10"+ shells. To answer you question at the bottom I would say BP is far more important than H3 simply because BP is used in so many things. AND if you're using balsa charcoal, you can make a VERY hot BP using balsa, maybe even so to the point that you wouldn't even need H3. Thats just my 2 cents though. It's all about how much you mill it as well as granulation, two very important factors, as I'm sure you are aware of. Edited March 11, 2013 by BlastFromThePast
nater Posted March 11, 2013 Posted March 11, 2013 (edited) KP is a burst charge made from KClO4, Charcoal and Sulphur. Shimizu gives the formula as 70/18/12 with 2 SGRS as the binder. However many people make KP with the same ratio as BP and just swap out the oxidizer. Edited March 11, 2013 by nater
BlastFromThePast Posted March 11, 2013 Posted March 11, 2013 I was mistaken..My apologies. If one does swap KNO3 for perch what are the cons of using the perch as the oxidizer. If im not mistaken I believe the perchlorate based comp is more pressure sensitive, no?
Mumbles Posted March 11, 2013 Posted March 11, 2013 I think Nater made a slight mistake. KP is potassium perchlorate based, though the ratio he mentioned is right if you swap out where he said KNO3 for KClO4. In addition to KP, there are three related formulas published in Shimizu's FAST. KP is said to have about the same explosive force as H3, though requires more pressure to achieve this. Shimizu later recommends 1.2x as much paper for the KP shells vs. H3 shells. It is good for smaller to medium sized shells, say 3" though 6". The other three are just given numbers and come from a paper which I haven't the slightest idea how to find. The numbers correspond to the entry number from a series of burst compositions tested. These burn slower and with a little less force than KP. I've seen it recommended for shells 6" though 10". No. 44 is somewhat stronger than No. 5. I've only used No. 44 in an 8" double petal shell once. It definitely slammed open, but the portion of the flower that lit looked nice and generally symmetrical. No. 5Potassium Perchlorate - 70Charcoal - 30SGRS - +2% No. 44Potassium Perchlorate - 70Charcoal - 30Potassium Dichromate - +5%SGRS - +2% No. 46Potassium Perchlorate - 75Lampblack - 25Potassium Dichromate - +5%SGRS - +2% Anyway, the key to getting KP or any of these other compositions to work is good confinement. You really can't get enough confinement from typical lift charges. I suspect that these compositions would be useless for a normal lift application.
nater Posted March 11, 2013 Posted March 11, 2013 I think Nater made a slight mistake. KP is potassium perchlorate based, though the ratio he mentioned is right if you swap out where he said KNO3 for KClO4. Sorry about the typo, yes I meant KClO4. I edited my original post.
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