What do you all recommend for the number of layers when pasting ball shells of 3,4,5 and 6 inch?
Currently using 5 layers on three inch,rocket launched.
Shell pasting
Moderators: richardh08, Boophoenix, Lloyd
Re: Shell pasting
I dunno mate it would be good to have a rule of thumb wunit, with rockets doesn't it depend on what burst you use and what you want to happen to stars, inserts ,etc size of stars and inserts, would be good to get an experienced option . B
Re: Shell pasting
Thinking about this a bit I'd paste the shell for a morter or gun ,enough room for the leader and a little bit for moisture expansion, I reckon that would be it. B
Re: Shell pasting
Well no other input apart from Biffo.
Dave the 5 layer method works well but to be honest of late I now spike all my shells then use the maltase method of pasting.
Dave the 5 layer method works well but to be honest of late I now spike all my shells then use the maltase method of pasting.
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- Boophoenix
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Re: Shell pasting
Care to share more details of the spiking Ken? How does it effect the shells compared to pasting? Sounds interesting.
Re: Shell pasting
Interesting Ken.
Thanks for that. Also to Biffo.
I had a general idea of biffos advice for the larger shells.
I will post some pics of them later. Cheers
Thanks for that. Also to Biffo.
I had a general idea of biffos advice for the larger shells.
I will post some pics of them later. Cheers
Re: Shell pasting
This is one of my four inch shells with seven layers of pasting. Ready to finalise fuse and
attach to rocket.
attach to rocket.
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- Boophoenix
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Re: Shell pasting
Looks really nice to me David. I haven't pasted a shell yet. Which is quite funny since I'm on my second WASP ( Windman Automated Shell Paster ). I had a super stinger, but sold it to a friend so he could sell his to another friend. I now have the Hornet still in the box.
- richardh08
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Re: Shell pasting
I'm coming into the discussion late but, for what it's worth, here's my ha'porth of opinion.
Shimizu showed that, for any given required strength, the number of layers you need depends on the breaking strain of the paper and the radius (or diameter) of the shell.
In practice, using any number of different types of paper, shell content and burst charge, I've found over the years that, for a mortar-launched 3-inch shell, around 7 layers is about right for me.
The theory indicates that, to get the same strength of casing, the number of layers needs to be proportional to the diameter. On that basis, a 4-inch shell would need about 9 layers, a 5-inch about 12 layers and a 6-inch 14 layers.
Obviously, there are lots of other factors that come into play when considering the appearance of the break of shells of different sizes and with different content.
Shimizu showed that, for any given required strength, the number of layers you need depends on the breaking strain of the paper and the radius (or diameter) of the shell.
In practice, using any number of different types of paper, shell content and burst charge, I've found over the years that, for a mortar-launched 3-inch shell, around 7 layers is about right for me.
The theory indicates that, to get the same strength of casing, the number of layers needs to be proportional to the diameter. On that basis, a 4-inch shell would need about 9 layers, a 5-inch about 12 layers and a 6-inch 14 layers.
Obviously, there are lots of other factors that come into play when considering the appearance of the break of shells of different sizes and with different content.
Even when I'm wrong, I'm convincing.