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[Announcedflea]

I was gonna try the 2 pieces at 1/3 intervals and 1 in the cylinder extention. I use a Hill pump so i want to get it right the first time.

[dutchdaniels]

This is my first post here on this forum, and I was compelled to posts here basically out of a giant Thank You for the information I have milked off this group without contributing.

However, with regard to Depinger.....let me state that I am an Engineer by day and might be able to shed some light on the Depinger Topic: First off, just to clear the air.....the effect we are talking about is called "Simple Harmonic Motion", this is the movement of particles in a set distance that reverberate only at set distances between fixed points.....a guitar string is the best annalogy. In plain english......your Air tube is a set distance and when a vibration hits it, it will "Harmonize" a certain pitch based on the length of the tube...ie a Tuning Fork. To elimate this, the introduction of the most irregular and odd distances between obstructions will result in the least "Harmonic Motion".

Enough jibberish......I did thte 1.25" Tubbing Rollup style depinger in two peices at random intervals and I have absolutely ZERO ping. Took me 20 minutes and its now a dead issue for me......the "De-Pinger" topic has been resolved in my eyes. Find the length of your air tube, divide into three UNEQUAL parts and set your depingers at those levels. ...done.

[sacshooter]

This is my first post here on this forum, and I was compelled to posts here basically out of a giant Thank You for the information I have milked off this group without contributing.

However, with regard to Depinger.....let me state that I am an Engineer by day and might be able to shed some light on the Depinger Topic: First off, just to clear the air.....the effect we are talking about is called "Simple Harmonic Motion", this is the movement of particles in a set distance that reverberate only at set distances between fixed points.....a guitar string is the best annalogy. In plain english......your Air tube is a set distance and when a vibration hits it, it will "Harmonize" a certain pitch based on the length of the tube...ie a Tuning Fork. To elimate this, the introduction of the most irregular and odd distances between obstructions will result in the least "Harmonic Motion".

Enough jibberish......I did thte 1.25" Tubbing Rollup style depinger in two peices at random intervals and I have absolutely ZERO ping. Took me 20 minutes and its now a dead issue for me......the "De-Pinger" topic has been resolved in my eyes. Find the length of your air tube, divide into three UNEQUAL parts and set your depingers at those levels. ...done.

Thank you, welcome to the forum

Roger

[Vic]

So what you are saying is that the transient movement of the air in the chamber, caused by the opening and closing of the valve, causes a concusive wave to reverberate up the chamber in correspondence with the length with the length of the tube and this is what causes the ping? So disrupting the standing wave is what we want to do with the Depingers, right?

I find this utterly preposterous!

The question I find more interesting is whether some materials work better for absorbing this wave form? One guy is using silicon rubber versus vinyl, would simms type rubber even be more effective? Heck, just disrupting the propagation of the wave may be better suited via a harder material like vinyl because it can provide resounding interference waves to help neutralize the initial waves amplitude.

I will probably try vinyl first.

Vic

[RayK]

Hi all.

I think we all understand the cause and the solution to the Marauder ping in the rifles - even one piece of vinyl tube just off center of the air tube will eliminate the ping.

What remains to be determined is the lifetime of the material used.

I shared a post from a guy who used the vinyl tube which had turned to goo inside his air tube.

Motorhead has used silicone tube (from RC model car hobby) with good results. I bet this is a winner.

BTW, I tried a variety of designs (one or two pieces) and placements (center, off center, uneven thirds) in my Marauder pistol (P-rod), but the ping persisted. I finally just removed everything and decided to live with the ping.

Ray

[Vic]

How long is the chamber of the Prod? If it is shorter it may have a higher frequency wave and thus need a different material to absorb its resonance. Have you tried different materials? The delron discs someone built may work better beign a denser material.

Vic

[RayK]

Yes, it is shorter. It sounds similar to the ping in the rifle though.

Motorhead has my P-rod. We'll have to ask him his take on the ping.

Ray

[Sendler2112]

To elimate this, the introduction of the most irregular and odd distances between obstructions will result in the least "Harmonic Motion".

.
Yes. Use the "Golden Ratio" to place two de-pingers at the most effective depths in the air tube.
.
http://goldenratiocalculator.com/
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http://en.wikipedia.org/wiki/Golden_ratio
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Think breaking up the air wave resonance more than damping the metal tube walls. The ideal de-pinger would completely block the bouncing waves without restricting the original air burst. A real world de-pinger will find the best compromise between the two. The plug drilled with multiple holes like a sink strainer would work well. A full cinnamon roll of silicon tubing with notches cut out of one side of it's length (notches in the outer circumference of each roll) would be easy and would only use up the volume of the remaining wall thickness times length ( not it's internal volume).

[zaphod621]

I tried the 2 1/2" x 1/4" thick vinyl using the butted ends"O" method at 1/2 way down the cylinder on my .25 Mrod and it still had the ping to it. Yanked that out and replaced it with two 1 1/4" peices using the coiled or cinnimon roll method placed at 3/4 and at 1/3 the way down the tube.
I don't pretend to understand it but to paraphrase B.B. King: "The Ping Is Gone".

[dutchdaniels]

You said it Zaph,......"Ping is Gone"! I got a little flack up above by an unqualified Googler.......but I assure you, the science behind this is rather simple, and I know what I am talking about.

I'll elaborate, because I think its pretty cool to understand; Harmonic Vibration in air is easily explained by looking at a Flag Pole rope......at a certain mph of wind, the rope will bang around and finally begin to vibrate at a certain frequency.......if you were to hold your finger down on a random location on the flagpole/rope, the now two sections of rope would begin to bang around at a different mph of wind and put out a higher vibration (would need a higher mph wind). So, if you were to hold two fingers down at two different and un-equal locations......the vibrations would be so different as to require two differnt wind speeds to get them vibrating........so, by breaking the distance in the air tank into 3 smaller and unequal sections requires the velocity of the air to be at 3 different speeds and at a much higher velocity than we will ever experience in our rifles......ie its Physically Impossible to Ping.

Ping is Gone.