Author Topic: Barrel shrouds  (Read 3060 times)

Alan

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Barrel shrouds
« on: April 01, 2016, 02:46:00 PM »
It seems that the term Barrel Shroud is sort of synonymous with the terms LDC, Baffle, muffler, etc.; a silencer in other words. And, in some cases that is what they are. But if you look at a Hatsan AT44 (et. a;.), it has a barrel shroud that doesn't do anything but make the barrel look bigger, as the silencer is a separate piece.

Having come from the powder end of the business, it would seem to me, that allowing the barrel to float free would yield a better accuracy. Any opinions?


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Alan

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Motorhead

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Re: Barrel shrouds
« Reply #1 on: April 01, 2016, 03:00:17 PM »
Shrouds CAN also stiffen a barrel & if said barrel sorta thin , can effectively help damping harmonics.
If a shroud is put under tension the effect of stiffening is quite dramatic !

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rsterne

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Re: Barrel shrouds
« Reply #2 on: April 01, 2016, 08:28:03 PM »
Some shrouds are purely decorative, to make the barrel look bigger in diameter.... some have the muzzle blast fed back inside, using the volume between the barrel and shroud to absorb some of the report.... and some are structural in that they act to stiffen the barrel.... This can be done by supporting the barrel at the breech, muzzle, and sometimes in between.... or the shroud can be put in compression by putting the barrel in tension to make the assembly stiffer in the quest for increased accuracy.... I have been using the latter for a while, and it is also used in the Slayer and FLEX.... AFAIK, I am, however, the only one using Belleville Washers at the muzzle to control the barrel tension over a wide range of temperature change, and to allow consistent setting of the tension.... My new Monocoque PCP can have the barrel tension set at well over 1000 lbs.... but the Belleville arrangement is not compatible with using the shroud as a suppressor.... which is illegal in Canada anyway....

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TexasInfidel

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Re: Barrel shrouds
« Reply #3 on: April 24, 2016, 03:29:25 PM »
NP2 Shrouds are junk bling Ill attest to that
So is that plastic "air diverter"  ::) that clips skirts on the second stage so it wobbles it way out to POI
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grumpy

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Re: Barrel shrouds
« Reply #4 on: April 25, 2016, 07:50:26 AM »
Some shrouds are purely decorative, to make the barrel look bigger in diameter.... some have the muzzle blast fed back inside, using the volume between the barrel and shroud to absorb some of the report.... and some are structural in that they act to stiffen the barrel.... This can be done by supporting the barrel at the breech, muzzle, and sometimes in between.... or the shroud can be put in compression by putting the barrel in tension to make the assembly stiffer in the quest for increased accuracy.... I have been using the latter for a while, and it is also used in the Slayer and FLEX.... AFAIK, I am, however, the only one using Belleville Washers at the muzzle to control the barrel tension over a wide range of temperature change, and to allow consistent setting of the tension.... My new Monocoque PCP can have the barrel tension set at well over 1000 lbs.... but the Belleville arrangement is not compatible with using the shroud as a suppressor.... which is illegal in Canada anyway....

Bob

Hi Bob, Doug and I have been playing with barrel tensioners for quite a while now. :)

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Bob La Londe

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Re: Barrel shrouds
« Reply #5 on: April 25, 2016, 07:54:23 AM »
NP2 Shrouds are junk bling Ill attest to that
So is that plastic "air diverter"  ::) that clips skirts on the second stage so it wobbles it way out to POI

I thought the shroud on an NP/NP2 was to provide a more comfortable cocking handle. 

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mobilehomer

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Re: Barrel shrouds
« Reply #6 on: April 25, 2016, 08:52:53 AM »
Actually, the NP2 shroud works really well. Off, the report is like a .22LR, on, the pellet hitting the target at forty yards is louder.  The baffle was designed specifically for this gun and works quite well. The barrel is only 15.5" and the shroud makes it about 23", which makes cocking easier. Mine do NOT clip the pellet at all. One hole at twenty yards and about 1/2" at forty yards, with no wind.
« Last Edit: April 25, 2016, 08:55:05 AM by mobilehomer »
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TexasInfidel

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Re: Barrel shrouds
« Reply #7 on: April 25, 2016, 12:56:41 PM »
I ran a phone app db meter test with the shroud off and on.
Several runs each I saw 97-99db running 14.3 and 15.89.
Dint matter if the phone was at the muzzle or 6 feet.
Ran 6 more shots with JSB 18 and only dropped 4db.
Still 90+db. :-\
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