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Bent barrels- not the big problem people believe it to be... 
PostPosted: Wed Jun 20, 2007 2:55 am Reply with quote
AirGunEric
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The Feinwerkbau-2:



And a quote from the Robert Beeman airgun gallery:

Beeman Gallery wrote:
After one of the big SHOT trade shows, the owners of the Westinger & Altenburger Co. (Feinwerkbau) of Germany presented us with this amazing feat of airgunsmithing - a Beeman/Feinwerkbau Model 2 CO2 pistol with the barrel making a complete twist around the gas cylinder! The gun actually shoots quite well! Note that the all-important final inch(25 mm) or so is straight - that and the crown are the only really important parts of the barrel as far as accuracy is concerned. When some shooter would say " I think I see some little defect in the rifling way down inside my barrel, or the middle is a little off, or the barrel is not quite straight, and that is why I am not shooting well" , the airgunsmiths loved to bring out this gun and ask if his gun was more off line than this one!


link to to Beeman gallery: http://www.beemans.net/collection.htm


So- for anyone worried about a slight warp or bend in their barrel- if it isn't on the last inch or so of the muzzle- it's not an issue.

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PostPosted: Wed Jun 20, 2007 3:05 am Reply with quote
StevieLaner7777
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Ha Ha!! I think that counts as a "Funny Image of the Day" from ya AirGunEric!!

Though I'm still unsure of this affecting barrel wear!?!


Stevie Thumb Up!

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PostPosted: Wed Jun 20, 2007 3:20 am Reply with quote
AirGunEric
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Interesting idea- 'barrel wear'- would a lead pellet wear heavier on the spot where it encounters it's first "bend"? I would tend to think so- but- if the barrel was rifled properly for a specifically designed "bent barrel" gun- this could be overcome.

One other thing of course- soft lead pellets through a rifled steel barrel would do 99.9% of any wear on the pellets- not the barrel. The barrel would still see some amount of wear- but I wonder just how many pellets would have to be shot through it before it became an issue?

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PostPosted: Wed Jun 20, 2007 3:42 am Reply with quote
StevieLaner7777
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Your probably right AirGunEric!!

I think it would have to be quite a few hundred thousand pellets before this would become an issue.

Though I'm not too sure if rifling appropriately would change this, Think of the barrel being something like a bob-slayer louge (Bob-slay run).


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PostPosted: Wed Jun 20, 2007 8:52 am Reply with quote
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That's pretty amazing. Shocked

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PostPosted: Wed Jun 20, 2007 10:00 am Reply with quote
23ib0d0n
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AirGunEric wrote:
Interesting idea- 'barrel wear'- would a lead pellet wear heavier on the spot where it encounters it's first "bend"? I would tend to think so- but- if the barrel was rifled properly for a specifically designed "bent barrel" gun- this could be overcome.
Lead luricates steel, hence the reason gasoline at one point in time had lead added to it ~ prevented the hardened valves from wearing into the much 'softer' cast iron heads of the old muscle car era.

AirGunEric wrote:
One other thing of course- soft lead pellets through a rifled steel barrel would do 99.9% of any wear on the pellets- not the barrel. The barrel would still see some amount of wear- but I wonder just how many pellets would have to be shot through it before it became an issue?
Lead just deforms to the shape of the barrel, and as long as the shape of the pellet is correct as it exits the muzzle, then it should fly true as long as the twist rate and velocity are capable of stabilizing it.
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PostPosted: Wed Dec 12, 2007 6:29 am Reply with quote
broommaster2000
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Now, if you would want a really really long barrel, this would be the way to go and safe space. Mr. Green

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PostPosted: Thu Nov 06, 2008 4:29 pm Reply with quote
cw
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I saw that years ago and wondered how tough a job it would
be to clean the barrel.
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PostPosted: Fri Nov 07, 2008 5:12 am Reply with quote
broommaster2000
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I was just thinking how cool it would be if you had a rifle looks like this:


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PostPosted: Fri Nov 07, 2008 7:56 am Reply with quote
Rogerflat
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That twisted barrel reminds me of that old WWII rifle with the barrel curve at 30 degrees in order to shoot around corners. Btw, that rifle didn't work very well. I'm not sure how well it would work with an airgun, but if you say it does then I guess it does.

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PostPosted: Fri Nov 07, 2008 8:01 am Reply with quote
broommaster2000
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I heard about an MG with a curved barrel to clear the top of a tank. According to that, it did work pretty well, but was a bit to expensive to make, and there was usually enough infantry around a (German) tank to keep people off.

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PostPosted: Fri Nov 07, 2008 10:34 am Reply with quote
cw
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You'ld like to have a gun that looks like a trombone?
Broom, are you smoking that stuff again?
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PostPosted: Sun Feb 08, 2009 6:35 am Reply with quote
riverpete
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a twisted barrel does not affect precision or speed of a leaden projectile as much as one would think provided the final 2 inches remain straight. the feinwerkbau barrels are slighly choked just before the muzzle to perfectly center the pellet, like many other german airgun/pistol barrels.

the Sturmgewehr 44 "Krummlauf" is a different issue, it was chambered in 8x33 with a shorter bullet than the 8x57 caliber generally used in german military rifles of that time. this should allow the projectile "go round the bend". still, the fmj bullets wore out the barrels after a few hundred rounds rendering the whole project pretty useless.
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PostPosted: Sun Feb 08, 2009 11:53 am Reply with quote
AirGunEric
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There is, of course an issue with bent barrels when someone is trying to use fixed sights attached to the gun. If the front are rear sight are not lined up properly then it's tough to try and hit a target accurately. This not however, really a barrel issue per se, but a sight issue that might be corrected by either re-positioning the sights or straightening out a bent barrel to line the sights up properly.

Thought that should be mentioned as this topic surfaced again...
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PostPosted: Tue Jun 23, 2009 8:51 am Reply with quote
donwalk
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the u.s. also made thompson SMG's for shooting around corners for the street fighting in europe during WWII...they, obviously, were not very successful.

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Bent barrels- not the big problem people believe it to be... 
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