7 replies to this topic

[parabolic]

Is there anyone out there with a list available that details what Kg/cm2 or PSI that various pyrotechnic compounds can be safely pressed too?

The only info I have found so far is on Rich Wolter's website
whistle rocket end burner 8800PSI
whistle rocket core burner 6500PSI
but nothing about BP rocket's?

I'm very interested on pressing BP rockets and the only info I can find on this is from a website which states;

"Black Powder has a fine line between compression and self ignition, pressures up to 900 to 1000 psi. are typical pressures for pressing but a slight increase in this pressure can lead to combustion".
Is there any truth in this?

Can anyone supply info on the safe pressing pressure for rockets and also comets? perhaps a list can be drawn up and kept as a sticky?

Any help would be much appreciated. (I have searched the forum but found nothing)

[dr thrust]

think that ones "busted" if bp self ignited whilst pressing i don't think anybody would consider making rockets the risks would be to great, here a link to the creagan site
lots of information on pressing motors, i myself give bp 1lb rockets a couple of tons any more and my sleeves cant take it,

[parabolic]

yhea I know what you mean 900-1000psi,? I would have thought they would be many incidents already if that were true.

the website you mention I already know about and yes it is great source of info.

Edited by parabolic, 19 April 2010 - 11:56 PM.

[rocketpro]

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Edited by rocketpro, 06 August 2010 - 10:45 AM.

[parabolic]

That`s total nonsense! While there may be a slight chance of this happening when hand ramming rockets -- due to possible adiabatic compression of air molecules, you are very safe pressing black powder.

I press all my rockets to 5000psi and whistles to 8000psi. I know of others that press at 2000psi-3000psi (on black powder) and get good results, but the powder doesn`t consolidate all that well.

Rocketpro, thanks for your info, you make me feel more relaxed about this now. do you have any experience pressing comets? if so what pressure on them? I'm quite capable of making my own decent compression sleeves and the likes out of aluminium, the one's like you see on most professional pyro tool makers, I guess they wouldn't be making many out of this material if the propellant had a habit of going off during pressing.

[rocketpro]

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Edited by rocketpro, 06 August 2010 - 10:45 AM.

[icarus]

i read a report stating at pressures greater than 25 tonnes bp became dead pressed.Difficult to ignite and surface flame did not propagate through the pressed sample

[dr thrust]

agreed at that pressure it would be like trying to light glass, my press is rated to twenty tons, but my iffy homemade tooling would give up the ghost way before that lol

Edited by chris m, 20 April 2010 - 11:04 PM.