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new double barrel design

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new double barrel design

Unread postAuthor: bangmikkelbang » Sun Jan 06, 2008 4:21 am

heres my new double barrel design. tell me what you think
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Unread postAuthor: Mr. Beaver » Sun Jan 06, 2008 4:46 am

Its nice but with in your design, the connection of the lower barrel, cause the lengths to be different and the lower barrel to be longer overall.
I think you need to focus on making the barrels same length overall...
But beside it i think the design is good.

i'll make a drawing to explain in a while.
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 5:18 am

hmm well the whole double barrel thing has been suggested before (on the uksgc) and it might work but you could get more air going one way than the other or maybe the bore of one of the barrels would be tighter and there would be more friction so the projectile would come out slower, the power will also be less because the air is spread between two barrels

so i think the best way to shoot two projectiles at the same time is to put two projectiles in one barrel :)
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 06, 2008 5:24 am

ALIHISGREAT wrote:so i think the best way to shoot two projectiles at the same time is to put two projectiles in one barrel :)


Not strictly true.

Two projectiles in one barrel means you still have the same force (pressure acting on the projectile base area) but double the weight, so less energy.

By using two barrels (assuming you've increased the valve flow accordingly) you not have the force acting on double the area, so more energy ;)
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 5:48 am

jackssmirkingrevenge wrote:
ALIHISGREAT wrote:so i think the best way to shoot two projectiles at the same time is to put two projectiles in one barrel :)


Not strictly true.

Two projectiles in one barrel means you still have the same force (pressure acting on the projectile base area) but double the weight, so less energy.

By using two barrels (assuming you've increased the valve flow accordingly) you not have the force acting on double the area, so more energy ;)


yes but then you have the problems that i mentioned such as getting the same amount of air into both the barrels.
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Unread postAuthor: Mr. Beaver » Sun Jan 06, 2008 6:06 am

i just made a drawing of how i think you should make a double barrel...
Image
yeah it;s pretty simple but it's my idea of launching 2 projectiles same time same force different barrel tell me what you think..

i get it that the drawing look a bit like an ass,
but i dont care(dot)(dot)(dot) :wink:
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 06, 2008 6:07 am

If your barrels are say 0.5", hooking them up to a 3/4" valve like in the attached diagram, you'd get no loss in performance save for a little extra dead space.

Go on, let's see more creativity and less off the shelf parts on this forum :D
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Unread postAuthor: Mr. Beaver » Sun Jan 06, 2008 6:15 am

i just made a drawing of how i think you should make a double barrel...
Image
yeah it;s pretty simple but it's my idea of launching 2 projectiles same time same force different barrel tell me what you think..

i get it that the drawing look a bit like an ass,
but i dont care(dot)(dot)(dot) :wink:

[edit]: sorry for double post problem max_users_connections or whatever...
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Last edited by Mr. Beaver on Sun Jan 06, 2008 6:21 am, edited 1 time in total.
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Unread postAuthor: bangmikkelbang » Sun Jan 06, 2008 6:19 am

idk if im lookin at the diagram right but is that just epoxy acting as the wall? i just like the reliability of parts off the shelf. or maybe get a joint that actually looks like a " Y " and make it side by side double barrel. im not 100% if im right but should the airflow divide evenly both ways if its side by side? im just tryin to milk everyone of their superior knowledge ( something i dont have haha).
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 06, 2008 6:28 am

If you get a "Y" fitting that's the same diameter as the barrels, you'll get half the flow going to each barrel and less power. With my design and using a 3/4" or even better a 1" sprinkler valve, you'd get much better performance.

I'm a big fan of using epoxy as a casting material for custom reducers and endcaps, have a look here and at any of my finished projects.
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Unread postAuthor: grumpy » Sun Jan 06, 2008 6:34 am

you would get a more even airflow with something like this.
http://www.flexpvc.com/cart/agora.cgi?c ... nifoldType
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 7:49 am

Mr. Beaver wrote:i just made a drawing of how i think you should make a double barrel...
Image
yeah it;s pretty simple but it's my idea of launching 2 projectiles same time same force different barrel tell me what you think..

i get it that the drawing look a bit like an ass,
but i dont care(dot)(dot)(dot) :wink:


thats a good idea but it won't work for cylindrical projectiles because they would not fit side-by-side.
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Unread postAuthor: POLAND_SPUD » Sun Jan 06, 2008 9:26 am

why do you need two barrels ?? there aren't many modern real guns with two barrels and i think this suggests that it's not practical
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 06, 2008 9:38 am

POLAND_SPUD wrote:why do you need two barrels ?? there aren't many modern real guns with two barrels and i think this suggests that it's not practical


Lots of double barreled shotguns around, as well as pistols and rifles, but most are intended to fire one barrel at a time.
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Unread postAuthor: bluerussetboy » Sun Jan 06, 2008 9:38 am

POLAND_SPUD wrote:why do you need two barrels ?? there aren't many modern real guns with two barrels and i think this suggests that it's not practical


quite the contrary. plenty of double-barreled shotguns are still manufactured

and

double rifles are probably the most elegant of firearms and the price usually reflects.

http://www.doublegunshop.com/
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