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spring piston pneumatics

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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spring piston pneumatics

Unread postAuthor: Major Collins » Mon Apr 11, 2011 1:06 am

has anyone ever tried to make a spring piston pneumatic just like a break barrel or a single pump air rifle?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 1:18 am

A spring piston pneumatic and a single pump pneumatic are two different things.

With regards to spring pistons, my standard advice isnot worth it.
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Unread postAuthor: squidchicken » Mon Apr 11, 2011 5:45 am

its actually not a bad idea but, a pneumatic is so much more easier to use and make, also as you stated, it would be impossible to push down without levers etc, imagine how hard it would be if we didnt have hydraulic systems
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Unread postAuthor: Major Collins » Mon Apr 11, 2011 8:17 am

i ment single pump as in the action so what i ment to say was "single cock" just like a break barrel air rifle
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 9:02 am

It depends on the level of power you're after. The most powerful single stroke pneumatic I know of is the Parker Hale Dragon which manages 12 ft/lbs (less than 600 feet per second for a 1 gram projectile) which is pretty decent but not out of this world.

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Unread postAuthor: Big-E » Mon Apr 11, 2011 11:30 am

That's impressive for a single stroke pneumatic, I prefer the multi-stroke pneumatics personally.

I recently received a Crosman Titan in .22 as a gift, it's a break barrel, and it's my first serious adult air rifle. What I like about it is it has a nitro piston instead of a coil spring, pushes .22 pellets around 900 FPS.

I can't wait to take this thing out, weather is getting nicer.

http://www.pyramydair.com/s/m/Crosman_Titan_Nitro_Piston_Air_Rifle/2290

I have thought about making a spring-piston launcher that uses a gas piston rather than a coiled spring to drive the piston, it would almost be feasible. Also brings to mind all those pneumatic pogo stick projects I saw on here a while back :)

but still, your ammo should be smaller, as spring piston guns perform better with lighter ammo. Does anyone know off-hand what the largest caliber ever thrown from a springer was?
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Unread postAuthor: Labtecpower » Mon Apr 11, 2011 12:14 pm

I know Brian the Brain is currently building a pretty large bore gun.

light ammo gives higher FPS, but too light ammo damages the gun, as it doesn't prevent the piston from slamming in the front of the chamber.
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 12:23 pm

That Crosman looks a little tacky though looking at the price I'm not surprised. The first gas rams were those made by Theoben in the UK, they also make gas-ram kits for existing springers. I've fired a couple and it really is something else, though it will set you back almost 10 times the price of the Crosman.

Big-E wrote:Does anyone know off-hand what the largest caliber ever thrown from a springer was?


The biggest calibre modern springers are 0.25", however older models that used a bellows type action as opposed to a cylindrical piston could be much larger, this one for example is a whopping 0.70" calibre.

spring piston guns perform better with lighter ammo


I disagree, a light pellet tends to be forced out before the piston can develop its full pressure potential, as well as reducing resistance to the piston increasing wear.

This demo is a useful guide of the firing cycle.
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Unread postAuthor: Big-E » Mon Apr 11, 2011 12:44 pm

jackssmirkingrevenge wrote:That Crosman looks a little tacky though looking at the price I'm not surprised.


Actually, it's a very well built, solid gun. nice wood stock, pretty heavy compared to others i've used, this definitely isn't like a cheap daisy airgun. It's more like a no-frills version of the Benjamin nitro piston guns like the Trail.

I must admit, the trigger could be a little better, but it's first stage is adjustable, and I've experienced worse. The scope that came with it isn't the best either, but I was planning on getting another one eventually; it'll do for the time being. I wanted this to shoot spinners, most of my airguns don't have the snot to flip the targets to the top position on my targets, so this one will work nicely.

It's not as high end as some of the nitro piston guns out there, but honestly, for the price, it's a hell of a deal. I'll be sure to write up a review once I've put a few pellets through it.

BTW, thanks for the links, I keep forgetting about the bellows guns, I never really considered them as springers in the modern vein, but that makes sense, since they use a spring to drive the bellows. I love old airguns, they seem a lot more innovative than many current airguns.
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Unread postAuthor: Brian the brain » Mon Apr 11, 2011 1:53 pm

I know Brian the Brain is currently building a pretty large bore gun.


I know he's not building anything at the moment..

:roll:

The spring I wanted to use was way to weak.
I could compress it in a tube by leaning into the workbench...Hmm...

Not much gonna happen there...
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 2:02 pm

Big-E wrote:It's not as high end as some of the nitro piston guns out there, but honestly, for the price, it's a hell of a deal. I'll be sure to write up a review once I've put a few pellets through it.


I'll agree with you there, to be honest I've always tended to go for top of the line stuff when it comes to buying airguns but that doesn't mean value for money can't be found on the other end of the scale. Sometimes it's better to have a $100 rifle you use everyday than a $1000 rifle you handle with kid gloves and polish lovingly more often than shoot :roll:

I love old airguns, they seem a lot more innovative than many current airguns.


Indeed, the Girandoni uses the same basic principles as today's rifles, one wonders what the craftsmen of the past would have come up with if they had access to modern materials.
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