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Cylinder shell dimensioning


Arthur

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I'm well familiar with ball shells and now I want to design a cylinder shell or two, maybe a multibreak.

 

What size board discs should I start with?

 

I'm thinking that a shell should have about 1/8" clearance and maybe half an inch for string and paper so a disc would be say 3/4" less than the nominal tube bore. is this a good starting point?

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Fulcanelli 1 and 2 are the Bible of the cylinder shell.

Usually for 75 mm is used a case former 66 mm.

1 mm of chipboard 1.5 craft and cotton twine 0.5 pasting then the pass fire.

Obviously the process requires experiment and errors-success process.

 

 

Ps: find a Fulcanelli copy will give a detailed procedure from the start to the firing of cylinder shell, lot of hints for 1 or more break.

Edited by kingkama
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Actually, Pyrotechnica IX & XI, the "Fulcanelli Papers" are contained within. You may want to google them to see where you can buy them.

 

TRADITIONAL CYLINDER SHELL CONSTRUCTION A. FULCANELLI

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Most shells up to 6" start about half an inch below nominal. A 5" shell is normally built on a 4.5" former and discs. Much larger shells will offer more room since they have substantially more paper and string build up. The same dimensions are used by most prominent builders whether it's single or multi break until you get very large.
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