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Fastest BP


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#181 BrightStar

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Posted 05 October 2006 - 10:57 PM

...help needed please :blink:

Once dampened and allowed to dry, can dextrin bound riced BP simply be re-wetted to regranulate it, or does the dextrin undergo a one-way change and 'set' the first time this is done?

I've made a poor batch of BP testing a new method (the granules are too fine) and am wondering if I can save it.

Edited by BrightStar, 05 October 2006 - 11:41 PM.


#182 karlfoxman

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Posted 06 October 2006 - 06:08 AM

Dextrin can be re-wetted, this is why its not so good in damp climates. So yes you can re-wet your bp. Just so you know SGRS is the binder that is more difficult to re-wet.

#183 paul

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Posted 12 October 2006 - 11:03 AM

I did a burntime test for my CIA blackpowder.

1.07sec for 52cm distance. I?ll repeat that test several times to find the average burntime.

http://www.zippyvide...20006/untitled/

EDIT: It was almost 60cm for the 1.07sec...

I did two further tests: Both bp trains were 50cm long. The one took 0.84sec the other one 0.76sec.
I compared these values to the one from Dan Williams. He uses pressed and corned black powder with charcoal from a willow type tree.

You can see that my bp is much slower the pressed and corned type. (My average value with a third value is 1.6sec/100cm)
So the CIA bp burns at about 63cm/sec! Dan williams best value is 185cm/sec and the lowest 153cm/sec.


These values are ok I guess, I always used to use it with every device I make.

Edited by paul, 12 October 2006 - 12:19 PM.

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#184 Stew

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Posted 13 November 2006 - 04:56 PM

Hey i milled up a batch of BP and it has a very slow burn rate. I used the ratio 75:15:10 and when i put it in a line to test it the burn rate was about 1sec for 10 cm. Whats going on?!

#185 Ritual33

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Posted 13 November 2006 - 06:42 PM

Sources of your chems, mill time etc?

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#186 Stew

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Posted 13 November 2006 - 07:23 PM

milled for 3 hours. kno3 from a garden shop but willow charcoal and sulphur from ebay (dodgy i know but seem fine!).

#187 Ritual33

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Posted 13 November 2006 - 07:27 PM

I'd say it was the kno3, where did you buy it?

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#188 Stew

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Posted 13 November 2006 - 07:40 PM

oh sorry forgot bought that off ebay aswell..sell sum dodgy stuff on there. i have made smoke bom*s with it and seems to work fine? confusing.

#189 Ritual33

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Posted 13 November 2006 - 07:50 PM

Ahh, thought maybe you had brought some general fertilizer stuff. What are you using to weigh the chemicals?

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#190 Stew

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Posted 13 November 2006 - 07:52 PM

small digital scales. accurate to 0.01grams so i don't think that's the problem.

#191 pyromaniac303

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Posted 13 November 2006 - 07:54 PM

oh sorry forgot bought that off ebay aswell..sell sum dodgy stuff on there. i have made smoke bom*s with it and seems to work fine? confusing.


Impurities only seem to show thereselves when you want something to burn rapidly, or with a colour. Slow burning things like smokes can still work well with fire retardants mixed with them, you just get a slight burn rate change. (from my experience anyway)
You can never have a long enough fuse...

#192 Stew

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Posted 13 November 2006 - 07:58 PM

hmm so just impure chemicals then?

#193 Caramanos2000

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Posted 01 March 2007 - 01:57 AM

Would this even work? http://cgi.ebay.com/...mMakeTrack=true

#194 portfire

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Posted 01 March 2007 - 01:46 PM

I dont think it's any good for BP but it has it's uses

http://www.pyrosocie...ivated charcoal
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#195 paul

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Posted 14 March 2007 - 06:59 PM

It has no use for real black powder :)

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