Almostparadise Posted November 12 Posted November 12 Ive been making a few cylinder shells recently and they seem to be quite a bit louder on the launch than the same 3" and 4" diameter ball shell. Im wondering if lengthening the mortar tube 6" + or - (in addition to the tubes being buried) would dampen the sound enough to make them sound closer to the ball shells launch. Another thing is that I do not know how adding another 6+ inches would change how they lift and perform in the air?
FiroweWorks Posted November 13 Posted November 13 What is the tube length you're already using? It can increase lift height by adding length to tubes. But, after continuing to add length to a tube for the same size shell, it eventually becomes pointless and won't make a noticeable change in launch height.
cmjlab Posted November 13 Posted November 13 I always assumed that cylinder shells are a bit louder since their typically heavier than ball shells, and their shape compared to a ball shell - i have no science to back that up though. How much lift are you using? 1
Almostparadise Posted November 13 Author Posted November 13 (edited) 10 hours ago, FiroweWorks said: What is the tube length you're already using? It can increase lift height by adding length to tubes. But, after continuing to add length to a tube for the same size shell, it eventually becomes pointless and won't make a noticeable change in launch height. 3" mortar is 18" and 4" is 24". 10 hours ago, cmjlab said: I always assumed that cylinder shells are a bit louder since their typically heavier than ball shells, and their shape compared to a ball shell - i have no science to back that up though. How much lift are you using? I use just shy of 10% of shell weight. More lift = more sound i suppose. I just was not aware if there were any negative consequences to lengthening the mortar tube. I think I'll give it a try with one of them. I use steel pipe just because I have a free source so I'm going to cut a 24-in long 3-in tube and see if there's much of a difference and then go from there. Edited November 13 by Almostparadise
Arthur Posted November 13 Posted November 13 If you look at YT vids many a Maltese cylinder shell is longer than the mortar is deep, so that the shell actually sticks out of the tube
Almostparadise Posted November 13 Author Posted November 13 (edited) 27 minutes ago, Arthur said: If you look at YT vids many a Maltese cylinder shell is longer than the mortar is deep, so that the shell actually sticks out of the tube Really?? I'll have to check that out. I'm wondering if that is by design or if it's just the way it works out at times. Very interesting. Edited November 13 by Almostparadise
Carbon796 Posted November 13 Posted November 13 (edited) Adding 6" in length probably won't affect the sound much, if at all. You may get slightly more altitude. I used to shoot 6" multi breaks from a 60" steel buried gun. ( Steel guns should always be buried or barricaded. Especially for multibreaks or shell that have flash based components or boosters. ) Our 8" gun was similar in length iirc. I don't personally think they were any quieter than a standard 6x gun. Cylinder shells just leave the gun with a kick. The 10% by weight rule. Is for ball shells. Part of the additional length of Maltese shells is due to the lifting style/method used. Which is different from traditional American/Italian styled shells. Edited November 13 by Carbon796
Almostparadise Posted Saturday at 12:51 AM Author Posted Saturday at 12:51 AM On 11/13/2024 at 9:58 AM, Carbon796 said: Adding 6" in length probably won't affect the sound much, if at all. You may get slightly more altitude. I used to shoot 6" multi breaks from a 60" steel buried gun. ( Steel guns should always be buried or barricaded. Especially for multibreaks or shell that have flash based components or boosters. ) Our 8" gun was similar in length iirc. I don't personally think they were any quieter than a standard 6x gun. Cylinder shells just leave the gun with a kick. The 10% by weight rule. Is for ball shells. Part of the additional length of Maltese shells is due to the lifting style/method used. Which is different from traditional American/Italian styled shells. Okay, that gives me something to think about. So the 10% weight rule is for ball shells, is there a rule for cylinder shells?
cmjlab Posted Saturday at 01:24 AM Posted Saturday at 01:24 AM Generally 1oz per pound up to 10 lbs, then 1/2 oz per pound after that, is what is written in the Fulcanelli Articles (Pyrotechnica IV and VI). My math isn't great but I think that's approximately 6%, if you prefer percentages. 1
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