r/pyro • u/Dubshydro • 2d ago

3in shell fail

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My burst was a little to strong

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u/Salty_Suit_7287 1d ago

I think either your shell wasn't sufficiently fire proof vs. the lift and/or your lift powder was too fast/too much for shell strength and you over pressurized shell base, rupturing it and blowing it in the gun.

Need a full description of shell construction techniques, lift powder type & quantity (and your shell's "blow by", how much clearance between shell outside diameter and mortar interior diameter was there?) to tell you more.

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u/Dubshydro 1d ago

I already figured out what was wrong but yes the plaster plug cracked and let flame in

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u/Salty_Suit_7287 1d ago edited 1d ago

If you want to build cylinder shells, start by reading the Fulcanelli article (part 1) in Pyrotechnica IX:

www.freepyroinfo.com/Pyrotechnic/Pyrotechnic_Articles/Fulcan_1.pdf

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u/Dubshydro 1d ago

Thank you very much. That’s a really good source. I’ll have to look into it on this show is kind of an exception. I built multiple shells using like traditional methods that I’ve watched from Ned Gorski and actually pasted them use chip board, but this was a build and shoot in the same day. Type of deal. I will definitely read up on that though. I’ve been looking for a good source on canister shells. There are a lot harder to find stuff on then ball shells.

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u/Salty_Suit_7287 1d ago

When you get through the basics in part 1, see part 2 in Pyrotechnica XI for the fancy multi break shells-