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carbon fibre pen gun

Built a miniature cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: POLAND_SPUD » Sun Oct 28, 2012 4:07 pm

lol alcohol Y U make me forget things?


since it worked well it seems I give good advices, don't I ? heh :-D
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Unread postAuthor: sharpshooter11000 » Sun Oct 28, 2012 4:16 pm

Haha :lol:

Looks really nice JSR, loving the carbon fibre! I'm guessing the metal parts are epoxied in and you didn't machine threads in the CF?
I wonder what the performance increase would be if you used .177 pellets... (With a .177 barrel, of course)
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Unread postAuthor: POLAND_SPUD » Sun Oct 28, 2012 4:34 pm

I wonder what the performance increase would be if you used .177 pellets
there won't be any performace increase to be honest

heavier ammo equalls more efficient system - that's due to the speed of sound

so .22 cal version is more efficient than .177 cal - at least as far as energy put in by muzzle energy achieved is concerned - it could be different if you focus on penetration, which jsr has found to be better for .177 cal than .22 (IIRC)
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2012 4:43 pm

sharpshooter11000 wrote:I'm guessing the metal parts are epoxied in and you didn't machine threads in the CF?


Yup, epoxy to epoxy, dust to dust :)

there won't be any performace increase to be honest

heavier ammo equalls more efficient system - that's due to the speed of sound


Yup, for a given system, bigger bore and heavier projectile will give more muzzle energy.

so .22 cal version is more efficient than .177 cal - at least as far as energy put in by muzzle energy achieved is concerned - it could be different if you focus on penetration, which jsr has found to be better for .177 cal than .22 (IIRC)


Time for one of my favourite quotes te be dug up :)

A 68 pounder smoothbore and a 7 inch Armstrong gun firing 200 lb shot had been fired at 4.5 inch plate backed by 18 inches of teak. The 68 pounders had penetrated the target, while the 200 pounder had made hardly any impression on it. Noble showed that the answer lay in the relative velocity of the two projectiles. The 68 pounder had been moving at 1,425 feet per second when it struck, while the 200 pounder was loafing along at a mere 780 feet per second. On the face of it, the 200 pounder with 156,000 foot-pounds of energy should have out performed the 68 pounder with 96,900, but the low velocity of the heavier projectile allowed the plate to deform and resist the blow, whereas the higher velocity of the 68 lb shot tore through the plate before it could begin to absorb the blow.


As Noble said in his paper, "What is wanted is velocity; if you sacrifice it to weight you will only be able to keep knocking at the door without entering."
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Unread postAuthor: sagthegreat » Sun Oct 28, 2012 5:22 pm

how many psi can this tubing handle?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2012 11:08 pm

sagthegreat wrote:how many psi can this tubing handle?


It's not pressure rated, but given the 1:10 ratio of wall thickness to inner diameter, and small bore, I'm happy to take it to "normal" 300-400 psi pengun pressures.
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Unread postAuthor: Gun Freak » Sat Nov 10, 2012 8:29 pm

You make me want to give up, Jack. Carbon Fiber makes everything look cooler, I guess :D
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Unread postAuthor: sagthegreat » Sat Nov 10, 2012 8:54 pm

What is the highest psi/ smallest wall thickness steel we can get, lets make some pen guns that look like pens and go to 1000 psi, and sell them to the military
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 11, 2012 12:48 am

Gun Freak wrote:You make me want to give up, Jack.


You misunderstood, I make you want to invest in machine tools :D

lets make some pen guns that look like pens and go to 1000 psi, and sell them to the military


The military have no use for pen guns, and if they did, they would probably use powder burning ones...
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Unread postAuthor: jakethebeast » Sun Nov 11, 2012 2:16 am

How about upping pen gun with steroids and then put it to a cane? :D Shouldn't be too hard...
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 11, 2012 3:13 am

jakethebeast wrote:How about upping pen gun with steroids and then put it to a cane? :D Shouldn't be too hard...


A cane gun would definitely have much more power due to the bigger volume and barrel length.

http://www.ebay.com/itm/Derby-Handle-Ad ... 3cc7dc0c7c

Pretty cheap if one wanted to convert it...
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Unread postAuthor: sagthegreat » Sun Nov 11, 2012 10:31 am

lets make some pen guns that look like pens and go to 1000 psi, and sell them to the military


The military have no use for pen guns, and if they did, they would probably use powder burning ones...[/quote]


Spys would have a use, and not to mention the types of substance that can be put on hollow tip pellets to make them "magical"
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 11, 2012 11:45 am

sagthegreat wrote:Spys would have a use, and not to mention the types of substance that can be put on hollow tip pellets to make them "magical"


If you have magical substances then you don't need much power ;) if they do need power, powder burners offer it in a much more compact package:

Image

A pneumatic pen gun with the equivalent power to a 22 rimfire would have to be pretty huge.
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Unread postAuthor: sagthegreat » Sun Nov 11, 2012 6:39 pm

I want that firing cap thing up have. But I don't have a lathe...
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 12, 2012 3:33 am

sagthegreat wrote:I want that firing cap thing up have. But I don't have a lathe...


You can make a request here ;) I'm sure someone nice can make you something for a few bucks.
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