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BP for blackmach


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#1 THEONE

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Posted 10 January 2022 - 09:19 AM

Even if blackmach is made with a slow BP, it will still perform really well inside a paper tube. For making blackmach BP was thinking not to use my willow charcoal but any other charcoal i can get. I am sure it will still work nicely. What it is more important to me is, when you use it for crossmaching or "priming" the spollette with it, is it better for it be burned fast (using willow ball milled BP) or slow (lower quality charcoal using a coffee grinder)  ?



#2 Arthur

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Posted 10 January 2022 - 01:13 PM

Personally I consider it best to have one good powder in several mesh cuts, if you want less power use less powder.

 

Whether willow charcoal is easily and economically available to you in your locale I don't know. However once you have good powder with an economical charcoal that's all you need. You will determine what locally available wood makes good powder -there are also resources on the http://www.wichitabu...orks/index.html



#3 THEONE

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Posted 10 January 2022 - 02:05 PM

Personally I consider it best to have one good powder in several mesh cuts, if you want less power use less powder.

 

Whether willow charcoal is easily and economically available to you in your locale I don't know. However once you have good powder with an economical charcoal that's all you need. You will determine what locally available wood makes good powder -there are also resources on the http://www.wichitabu...orks/index.html

I have access to willow and pine, but pine is super easy for me to get so i am going to use pine for blackmach / spollettes and willow for lift and burst. BTW is there any way to make blackmach more flexible ? so it wont crack or flake when you house a spollette with it ? Will just a bit of wood glue (PVA) about 1% to the BP/ dextrin mix make the blackmach more flexible ?



#4 Bourbon

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Posted 10 January 2022 - 03:03 PM

I just read thee other day, someone was using thinned white glue as a binder for more flexible blackmach. When bending, no busting or cracking, also, no crumbles. I can't remember where though. They said it didn't seem to slow it to much as long as it was thinned enough. I think they said 50/50. They said it worked great.


Edited by Bourbon, 10 January 2022 - 11:47 PM.


#5 Richtee

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Posted 10 January 2022 - 03:23 PM

I’m gonna try some spray adhesive down a length of tube, and just pout powder thru it. Or- possibly coat the string with the stuff and roll on the powder.

 

I don’t use much QM obviously. Barely any as I’m “retired”  heh..but I still do smaller projects now and again, and enjoy working on methods of construction.


Edited by Richtee, 10 January 2022 - 03:26 PM.

I like smoke! On food or in the air equally well.

#6 Richtee

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Posted 10 January 2022 - 04:03 PM

Well, the tube/spray works. I bet the string would too... and should be quite malleable I’d think.

 

Used 3M “77” spray adhesive.


I like smoke! On food or in the air equally well.

#7 THEONE

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Posted 10 January 2022 - 04:23 PM

Too bad you have retired, i can see not much going on to this forum anymore. That is sad.



#8 Carbon796

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Posted 10 January 2022 - 07:36 PM

Using a faster BP quality powder is preferable to a slower one, for spolette's. It will contribute to a more reliable device. And, reduced timing errors, if you use them for precise timed effects.

The BM should have the BP slurry thoughly worked into the core of the string. With the excess removed from the outside, with a sizing die. If your just coating the outside of the string with slurry. Its typically referred to as bundle match. Which is far less durable.

My preference would be a hotter, faster, aggressively burning BM. For top hat-ing/cross matching fuse, spolette's and nosing spolette's. If it's slow and sluggish. It may not withstand stronger breaks and higher velocity's. You don't want it to contribute to delayed timing and ignition issues.

Edited by Carbon796, 10 January 2022 - 08:22 PM.

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#9 THEONE

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Posted 11 January 2022 - 01:56 PM

Thanks for your reply. So i am going to use pine charcoal BP for quickmach only. Blackmach for spollettes would be made with willow charcoal. 2 types of blackmach. Spollette composition also with willow charcoal.






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