1569 replies to this topic

[pihop]

I don´t see any lack in experience, dude! Quite the opposite! I like your shells. You´ve
managed to get some nice, and ROUND breaks there. This let´s me think you´re not
THAT inexperienced Keep that good stuff coming and give us some construction pix
next time if you don´t mind.

Thanks man!
Actually I'm quite inexperienced. I'v made a total of 7 shells, 4 plastic 3", 2 paper 4" and 1 4" can shell.
Somehow I'v managed to get all of my shells very good from the beginning. If you take a look at my youtube site you can see that my first 3" plastic one was quite good.

Next project is a 4" can with 1" Winokur 39 crosettes.

[portfire]

sasman, i searched about the klumac formula and didn't found it. Can you give it to us?

Found it for you

Red (Klumac)

Strontium Nitrate 50
KCLO4 15
Parlon 12
Red Gum 8
Magnalium (200-400) 10
Dextrin 5
Boric Acid 2

dean

Edited by portfire, 14 November 2007 - 11:54 AM.

[leosedf]

Ah thank you!

Any priming tips?

[portfire]

Ah thank you!

No problem

Any priming tips?

Thats a question sasman will have to answer,as i've never used it.Back to topic now ........

[karlfoxman]

Rob: I have looked at some of the Gamon paper shells, the lump on the top hemi could be sanded off to make the top round. I have almost completed the 6" beraq shape shell. Just got to fill it and paste it. I will be using my normal burst and 10% added whistle. I have made the beraq and filled them with my magnesium red flash. The shape is a 5 pointed star. Ill post some pictures and the video when I fire it.

[pihop]

Karl---> Is your beraq shell going to be round or cylindrical? I'm assuming round since you are makeing (with or without the e?) a pattern shell.

[karlfoxman]

It will be a ball shell, 6" paper one. The beraq will be placed onto a card template inside the shell.

[pihop]

Looking forward to the filmclip!

[karlfoxman]

Here is a picture of some of my 100mm Beraq shells, these had 26 1/2" Beraq and 8 3/4" ones. They all worked very well, they were all made by handin the traditional way of manufacture.

Beraq Shells

[Bonny]

Here is a picture of some of my 100mm Beraq shells, these had 26 1/2" Beraq and 8 3/4" ones. They all worked very well, they were all made by handin the traditional way of manufacture.

Beraq Shells

What is the OD and wall thickness of the tubes you are using to make those? Are they bottom fused? I've tried to make cylinder shells using 3" ID .070 wall tubes, but have more or less blown them all apart in the mortar. http://ca.youtube.co...h?v=CZ2DyZz25MQ

I'm not sure if the bottom cardboard disc is being pushed in from too much lift or maybe the fuse pushed in...

[paul]

What is the OD and wall thickness of the tubes you are using to make those? Are they bottom fused? I've tried to make cylinder shells using 3" ID .070 wall tubes, but have more or less blown them all apart in the mortar. http://ca.youtube.co...h?v=CZ2DyZz25MQ

I'm not sure if the bottom cardboard disc is being pushed in from too much lift or maybe the fuse pushed in...

Looks like a fuse malfunction. Its definately not a flowerpot as the shell explodes when its out 10 or 15m of the mortar.
Using spoolettes or time fuse? Or even visco?!
Anyway, great effect, like a delayed mine

[Bonny]

Looks like a fuse malfunction. Its definately not a flowerpot as the shell explodes when its out 10 or 15m of the mortar.
Using spoolettes or time fuse? Or even visco?!
Anyway, great effect, like a delayed mine

That one used 3/32" visco...2 pcs masking taped together IIRC. I think I was told flame may have quickmatched between. It was actually better than the other 3" attempts as far as effect went...they're also on my youtube.

[Mumbles]

Yeah, it's because you used 2 fuses taped together. Try using one next time, and top fusing the shell. It should get up to the appropriate height. If they were taped together, I'm actually a little suprised it DIDN'T flower pot

[karlfoxman]

Bonny: These are tubes from Plasticos Gamon, they are about 3mm thick and at a guess (dont have any to hand right now) about 95mm OD. The cases are strong but not good for making circular breaks, next time I make beraq 100mm shells I will use my own ones and spike them. These are hard to break well,I did have a 125mm one break very well but the smaller 100mm ones are hard to break. The end caps are moulded plastic, the fuse is push fit 10mm stuff from a company in Portugal IIRC. If i was you I would use top fusing and not visco if you can, ram your own spoolettes for them. You need to work on the construction, the main strength for cylindrical shells is the placement of the stars, pumped stars that are stacked like a brickwall are the best for strength. Or make the cans stronger and dump the stars inside. I have seen 75mm cylinder shells that have stacked stars in Malta.

Here are a few pics:

75mm Shells

Beraq shell (See how they are stacked like a 'brickwall'

Comets loaded inside 6" shell

Hope this helps, these are all of Maltese fireworks built by St Joseph's Fireworks

I have made 6" 2 Break shells that weigh over 6kg, because the comets inside are stacked this provide lots of structual integrity and stop the shells getting damaged under lift. Quick note the power of lift will bury a 6" tube 1foot from recoil, this gives one an idea of the power the shells have to take on lift! I have pictures of the mortar before anf after the shell was fired, its incredible the power 200g of 1hour milled rough powder has.

Edited by karlfoxman, 16 November 2007 - 09:48 PM.

[KarlosH]

Oh! Karlfoxman´s fireworks factory! Who made all of the shells in the pictures? This is not work for one man. Great.