74 replies to this topic

[tdpyro]

I have recently designed and built a Visco machine, it's just about complete, just a few more refinements to the pulleys and nc application. When its complete , I will upload photos and hopefully a video of the machine in action.

I was just wondering if any of you guys knew of some Visco compositions , other than standard meal?
Don't some types of Visco use a perchlorate based composition?
Ive used standard meal, which worked great, but it does not seem as aggressive as some of the commercial fuses (it doesn't fly all over the place like a little rocket engine).

Any help is appreciated.
Dave

Edited by tdpyro, 19 October 2005 - 06:50 PM.

[Dj Killerboss]

Hi Dave


sounds good
Can you upp a construction plan of it??
i think in commercial fuses are very finely bp, do you ball mill it??
i don't think that they use perchlorate based composition
because i think its too dangerously in youth-free firework.
so why should they use it in the other viscos???
i hope your machine works great at the end

Chris

[tdpyro]

I have been using a very fine granulated BP (100-200 mesh). Ideally you want to use powder, but it does not flow at all, just gets jammed and causes all sorts of problems. But when its granulated it flows beautifully.

It's just that I have heard perchlorate fuse mentioned before and was just wondering if anyone knows any more on this.

When I have completed the machine , I will upload some more details (don't worry it won't be long ).

Edited by tdpyro, 23 September 2005 - 06:22 PM.

[KC Blast]

That sounds great. I'm looking forward in seeing the completed machine. I'm in this hobby not only to expand my mind in "seeing" what I can actually doing, but experimenting with stuff like what you are accomplishing! I hope it works great for you and maybe a new set of DIY plans are in the making for our hobby!

[Rhodri]

Hi gang

I believe 'flying fish' type fuse (silver white) is based based on perchlorate, C and Al. There's no sulphur in this type of fuse.

[paul]

I was just wondering if any of you guys knew of some Visco compositions , other than standard meal?

In patents regarding the manufacture of visco a few more formulas are mentioned:


- 30g Potassiumsilicide
70g Pb3O4
kneaded into a mixture of 15g NC and 10g dibutylphthalat

- Ordinary 70/30 KNO3/charcoal bound with nitrocellulose.

(These two are sprayed as a "liquid" into a fusebody, so these may be not of your interest.)


The following mixtures are designed to the use as relatively slow burning mixtures in visco-style fuses:

- 70parts blackpowder, 15parts KNO3, 15parts charcoal

- 40parts charcoal, 55party KNO3, 5parts sulfur

- 45parts charcoal, 55parts KNO3

Especially for waterproof coated visco, these documents mention a mixture of:

35parts charcoal
55parts KNO3
10 parts calcium fluoride

and

35parts charcoal
50parts KNO3
10parts calcium fluoride
5parts sulfur



greets,

paul

Edited by paul, 24 September 2005 - 04:17 PM.

[Pretty green flames]

Someone on rec.pyro posted his visco design a while ago, anyway here's the link.
Visco

[Djsethall]

Howdy Y'all
This is my first of hopefully many posts here at the forum. I am currently designing a visco fuse loom. One thing I was reading about on here is using the tracer line to stirr the powder in the funnel down. I have employed this idea with two tracer lines spinning down parralel to the side of the funnel to keep it mixed in. The two tracer spools are mounted to the bottom of a plate that is held above the funnel so that no tangles are created. I would love to share these drawings. Let me know if anyone has autocad so that I can post them.

Justin

[paul]

Would be nice if you?d post them! XnView can read AutoCAD files. So no need to install AutoCAD

Would be interested in som technical details of that.

greets,

paul

[Djsethall]

How do I upload them?
They are in dwf format

[chemicalwazi]

Howdy Y'all
This is my first of hopefully many posts here at the forum. I am currently designing a visco fuse loom. One thing I was reading about on here is using the tracer line to stirr the powder in the funnel down. I have employed this idea with two tracer lines spinning down parralel to the side of the funnel to keep it mixed in. The two tracer spools are mounted to the bottom of a plate that is held above the funnel so that no tangles are created. I would love to share these drawings. Let me know if anyone has autocad so that I can post them.

Justin

Hi Djsethall

I have autocad, PM me and i will give you an e-mail address. If you send them over i will try and PDF them out and post them

[tdpyro]

I too was going to employ that technique of two parallel threads stirring the black powder, but I found that it was easier to implement a vibrating motor to the BP funnel. I just used a small DC motor with an eccentric attachment on the shaft. This allowed me not to use a tracer at all , and made the machine design easier.

[pyrotechnist]

Can you show use the finished device and how it works? i am confused on how it works.

[tdpyro]

Can you show use the finished device and how it works? i am confused on how it works.

I have completed the machine now and it is working great. I will upload some photos of it in action this week.

[JamesH]

Thats great news, this should be interesting!!