Shell Blast Diameter

[wizard7611]

What are the blast diameters of 3 inch and 4 inch shells? Does anyone have a chart?

-Thanks!:cool:

[Westpapyro]

Spherical volume = (4/3) x pi x radius3

Not sue if that helps but I stayed in a Holiday Inn last night!

[Playingwithfire85]

If I am not mistaken 3" shells are 400ft and 4" shells are 500ft.

[PyroManiacs]

http://i10.photobucket.com/albums/a128/KillaNinjaChuklz/fireworks-shell-altitude_zpsymeg3ssm.jpg (http://s10.photobucket.com/user/KillaNinjaChuklz/media/fireworks-shell-altitude_zpsymeg3ssm.jpg.html)

[ras1986]

That's a sweet ass chart

[PyroJoeNEPA]

What are the blast diameters of 3 inch and 4 inch shells? Does anyone have a chart?

-Thanks!:cool:

It will vary depending on the effect of the shell. The chart Pyromaniac posted gives you the approximate height to apogee for shell size. Some shells are time fused to break before they reach their apogee [point where the shell starts to drop] such as peony's & brocades. They will break "hard & wide". Other shells--like a horsetail or a willow will break "soft" and not cover as wide an area in the sky. They are timed to break right on the turn down of their apogee for maximum effect. [at least the good shells are.] Ball shells break symmetrically and will hurl their stars in a 360 degree pattern covering a very wide area whereas cylinder and canister shells break "around the drum" giving more of a two dimensional pattern.
A general rule of thumb if you are looking at layering effects for a show is to figure 100 feet per inch of shell in the sky.

@Chuck--bad enough I had to re-learn chemistry for this hobby--now you are going to throw math into the mix! Grrrrrr!

[PyroJoeNEPA]

That's a sweet ass chart

^^^what ras said.

[mguerra]

I was reviewing a video of some 3" shells I shot and there was a very wide disparity in the diameter of the breaks, even in shells of the same effect. I don't think there is a good answer to this question.

[Fire Art]

Break diameter for a similar effect can vary greatly from one brand to another. Cheaper shells don't break as symmetrically nor do they usually break as wide.

[wizard7611]

Spherical volume = (4/3) x pi x radius3

Not sue if that helps but I stayed in a Holiday Inn last night!

No, I was asking for the burst diameter. Thanks for all of the replies! I should have stated the average blast diameter. Anyway, thanks!:cool:

[wizard7611]

@PyroManiac1981 That is a bad-ass chart.:cool:

[Shootingstar_pyro86]

No, I was asking for the burst diameter. Thanks for all of the replies! I should have stated the average blast diameter. Anyway, thanks!:cool:

I'm found that most of the time that it's 1/3 of the radius you need for clearance. I.E. 3" shell 300ft=100ft (Give or take)

[wizard7611]

Alright, that seems more simple.