Author Topic: Barrel de-resonator???  (Read 2600 times)

mcc1961

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Barrel de-resonator???
« on: February 22, 2016, 11:08:23 PM »
Do you think  these barrel de-resonators have any effect on accuracy?     
« Last Edit: February 22, 2016, 11:45:16 PM by mcc1961 »



Alan

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Re: Barrel de-resonator???
« Reply #1 on: February 23, 2016, 06:07:06 AM »
Ah! The benefits of having grown up in a sporting goods store!

Like a lot of gadgetry, these "thingies" crop up from time to time, albeit in different forms and shapes, but the story is always the same—they supposedly improve accuracy. For the most part, they're smoke and mirrors, but always with their touts and guarantees. My take is, if they did fix or improve anything to do with accuracy, then something else was (is) amiss.
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rsterne

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Re: Barrel de-resonator???
« Reply #2 on: February 23, 2016, 08:20:46 AM »
I would tend to disagree.... Barrel harmonics have a huge amount to do with accuracy, and often our PCPs, with long, slender barrels can actually whip around a LOT.... However, just sliding one of these on your barrel and expecting it to cut your group size in half for the most part won't happen.... You have to settle on ONE pellet, at ONE velocity, and then use the sliding weight to fine tune the harmonics so that the pellet leaves the barrel when it momentarily pauses at the end of a vibration cycle to reverse direction.... By doing that, you increase the likelihood of each pellet leaving when the barrel is pointing in the same direction....

Put it I the wrong place, the groups will open up instead.... and the same thing may happen if you change pellet or velocity....

Bob
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mcc1961

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Re: Barrel de-resonator???
« Reply #3 on: February 23, 2016, 08:56:20 AM »
I noticed Tofazfou has one on his talondor and it is a super accurate rifle.

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Re: Barrel de-resonator???
« Reply #4 on: February 23, 2016, 09:59:33 AM »
 
I built several of these both rubber and oil filled and was always going to test them but never did I even sent one to Scott (Motorhead) for testing but never heard back from him and I forgot about it LOL. HEY SCOTT did it work???LOL

Tofazfou

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Re: Barrel de-resonator???
« Reply #5 on: February 24, 2016, 06:34:25 PM »
I noticed Tofazfou has one on his talondor and it is a super accurate rifle.

YEP!

So many variables from one guys gun to the next guys even if caliber is the same.  Shooting a heavy slug at higher pressure vs another guys LIGHTER slug at lower pressures makes all the differences.  Barrels are not EXACTLY all the same either externally or internally.

Without a doubt, when you move one of these as little as .5" forward or rearward, your groups shrink or get bigger AAAAAAND they change POI.  Like bob said, with these modern day airguns barrels tend to be THIN like .5 or .6"+- some thousandths.  On some guns, the air tube and or bottle tend to PING at the shot also which can cause some vibrations throughout the gun.  Lotsa things going on during the shot cycle.  But with out a doubt, they work.

DISCLAIMER:  I would have to add that, these things do not make an inaccurate bullet accurate.  You still have to have the RIGHT AMMO to start with.  For example:  If you have a 257 with 1-14" twist and you choose to cast and shoot 120 gr bullets, they are simply TOO long and heavy for the twist rate in said airgun and not even the de-resonator can make them ACCURATE.  It might improve groups from 4" at 75 yards to 3.25" but it won't make them .5" slugs because the bullet simply doesn't match the twist
« Last Edit: February 24, 2016, 06:37:58 PM by Tofazfou »

rsterne

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Re: Barrel de-resonator???
« Reply #6 on: February 25, 2016, 08:14:12 AM »
I don't really think the material they are made of makes any difference.... it is simply a matter of moving a weight along the barrel to change the harmonic frequency so that the position of the muzzle when the pellet/bullet gets there is more consistent.... You can achieve the same thing by tensioning the barrel.... That does three things, it stabilizes the position of the muzzle by holding it there in a larger (and hence stiffer) tube, the tension increases the frequency of vibration, and it also decreases the amplitude of the vibration.... Basically it makes the barrel act like a larger diameter, without adding a ton of weight.... Both the Slayer and the FLEX use that system, and of course my new Monocoque PCP is built to take maximum advantage of it.... The barrel and breech are mounted inside a very stiff tube, and the scope is mounted on top of it....

Bob

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mcc1961

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Re: Barrel de-resonator???
« Reply #7 on: February 26, 2016, 01:40:35 PM »
Got the de-resonator in the mail today ,hopefully get to try it out tomorrow.Maybe my .257 condor will shoot as good as Tofazfou's talondor.lol

Monkeydad1969

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Re: Barrel de-resonator???
« Reply #8 on: February 26, 2016, 03:05:04 PM »
Very nice, Mike.
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sixshootertexan

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Re: Barrel de-resonator???
« Reply #9 on: February 26, 2016, 04:04:03 PM »
Look at the whip on this springer.
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Windmeister

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Re: Barrel de-resonator???
« Reply #10 on: February 29, 2016, 03:13:31 PM »
There are some good videos out there explaining what is going on harmonic wise, but in essence the sliding weight is there to create a movable node, from where the oscillating along the barrel can be tuned. So what you want to happen is to generate a node relationship to your muzzle position, so the nozzle is the end node, meaning it doesn't move, regardless of the rest of the barrel.
Think if a sine wave, the nodes are where it intersects the centerline, a sliding weight let you tune the sine wave's position along the barrel.