Trying to find the best powder mix for homemade visco fuse

[T1st]

Hi,

 

I just made a visco fuse machine that took me weeks to tweak it just right to get a good visco fuse that looks very similar to factory made visco fuse, its not perfect but it looks good enough for now, The powder is fed into 12 cotton strings that wraps around it to make a powder core, then it is wrapped again in the opposite direction with 9 cotton strings and finally coated with NC lacquer and left to dry while under tension.

 

Now i am having a problem with the powder that i am using in the fuse, the fuse doesn't burn as violent and exciting as the factory made ones or even as some DIYers on YT who made visco fuse machines, i saw fuses that have a powerful thrust just like tiny rocket motor, the fuses that i made burn more like a match and doesn't have any thrust, maybe just a tiny bit at the end, it does have a consistent flame, it is water proof, and it burns very hot, but doesn't burn like how factory made visco fuse does, i am not sure if i'm right but i think my main problems is with the powder mix that i'm using.

i tried the following:

1- 75/15/10 black powder, ball milled.

2- same black powder but granulated, it clogged up the machine and the fuae diameter wasn't consistent.

3- same black powder with 20% 50/50 kno3 and magnalium.

4- same mix but with 40% 50/50 kno3 and magnalium.

5- straight up 50/50 kno3 and magnalium.

The charcoal is mainly pine, the granulated black powder that i make is so powerful and quick it makes a thump sound when it burns, so my black powder isn't the problem.

I tried the black powder with and without binders.

I am very certain that all my materials are very pure, so purity isn't the problem.

If anyone knows a good powder mix that i can try for better fuses please comment it below, i will be very grateful.

Btw i don't have ANY oxidisers other than KNO3.

 

I attached a photo and a video of my fuse, i want to make burn somewhat like this video: 

 

[Arthur]

Fuse powders can be any size to 6, 7 or 8FA which is pucked and corned then crushed almost to dust. Maybe use wire sieves and check that your powder is fine enough. However, do you really need it to look like visco? 1/4" time fuse doesn't look like time fuse but it does the job that it's intended for perfectly.

[Zumber]

This topic been discussed recently.

Pyrogreezer have already posted visco formula and he has very vast experience In fuse making.

You must need good quality bp ( hot charcoal )

For visco he mentioned blend of 70 percent 7F with 30 percent mead D.

As granulas burn faster ( propogative burning ) It could solve your problem.

[CountZero]

I think it looks great, to get what you talk about you probably need to switch to something perchlorate based? Or whatever is used in chinese visco. 

[DecimusMaximus]

the look and style of your visco looks awesome. the burn is not bad too!

[Richtee]

I’d kill to be able to make a fuse that nice. Surely it will meet any needs you have. What’s your complaint? It’s NOT other visco? So what.