carbon fibre pen gun

[jackssmirkingrevenge]

Just a little something I've been playing with, same old pengun design but using new materials.

I upped the calibre to 0.22", a bit overambitious and the 10mm internal diameter of the body tube does not allow for much air but still, it will happily push a 16 grain pellet through a beer can. Here it is in action at 300 psi:

[youtube][/youtube]

[pneumaticcannons]

Thats looks so awesome
So is the body re-enforced or completely CF?

[wyz2285]

Beautiful.
A 4.5 mm at 200 bar wound make this thing a serious killer

[Labtecpower]

ohh fap

that looks damn sexy

If you send a vid and some pictures to the producers of the James Bond movies you might even get a serious response, this wouldn't look bad in an Aston Martin

[jackssmirkingrevenge]

Cheers guys

So is the body re-enforced or completely CF?

No, pure CF tube. This stuff.

A 4.5 mm at 200 bar would make this thing a serious killer

I don't know if I'd trust this one with that pressure, but there's definitely scope for a 200-300 bar pengun...

If you send a vid and some pictures to the producers of the James Bond movies you might even get a serious response, this wouldn't look bad in an Aston Martin

Why would I want that bender using my stuff

[pneumaticcannons]

No, pure CF tube. This stuff.

Just had a "why didn't I think of that" moment. I mean, those arms are perfect; robust, sexy, and practically made of epoxy.
made of epoxy
made of epoxy

[Brian the brain]

Looks awsome!

I have owned commercial airguns ( pistol) with about the same performance...




With your machining abilities ....couldn't you get the most out of the concept by using hydraulic tubing?

Perhaps use an O-ringed sliding barrel as your valve, sealing against a rubber backplate...that would make it balanced so you could easily trigger it at high pressure...

[sagthegreat]

holy crap, a legit pen, except machined out of high pressure steel, go up to 1000 psi, OMG this has soo much potential

[jackssmirkingrevenge]

practically made of epoxy.
made of epoxy
made of epoxy

... and loosely packed diamonds

I have owned commercial airguns ( pistol) with about the same performance...

... and this is at just 300 psi! Tried it at 400 and it leaked :-/

With your machining abilities ....couldn't you get the most out of the concept by using hydraulic tubing?

The little sherline doesn't really like steel, but there's no reason why a sufficiently thick walled brass or aluminium small bore tube couldn't safely take 300 bar.

Perhaps use an O-ringed sliding barrel as your valve, sealing against a rubber backplate...that would make it balanced so you could easily trigger it at high pressure...

I had some ideas for a "valveless" variation:





The problem is that at those pressures, it's going to be bloody hard to trigger. Past 300-400 psi the ballistic knife is almost impossible to operate. On the other hand, that's with a 13mm bore and 1.32 cm² surface area. With a 4.5mm projectile, the area drops to just 0.159 cm²... so extrapolating that, if 300 psi is fine for the knife, then a BB firing pengun is good for 2500 psi... the seal fitment is a bit tricky for a spherical projectile though.

[POLAND_SPUD]

now that you have a lathe you could experiment with metal on metal seals

while wouldn't be exactly very useful for pneumatics it has some potential for hybrids (especially for cartridge hybrids)

[jackssmirkingrevenge]

Note that the first diagram in my previous post doesn't have a separate seal but uses a lead projectile, I think this could be made to work for HPA.

[POLAND_SPUD]

are you assuming that pellet skirts can expand on their own to form a seal ? I don't think that's really what you meant.

Probably one would have to use swaging to make sure the projectile is sealed tightly

[jackssmirkingrevenge]

Some form of swaging is obviously needed, but the shape of the skirt should help.

Remember this?

[youtube][/youtube]

It definitely works for lower pressures...

[POLAND_SPUD]

actually I don't

not bad so there was some testing done

but if it works for lower pressures wouldn't it work for higher pressures if there was a funnel shapped port (ie basicly a constriction) ?

[jackssmirkingrevenge]

actually I don't

It was done on your suggestion!

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