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Author Topic: How loud are modern PCP's ?  (Read 907 times)

Windmeister

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How loud are modern PCP's ?
« on: May 10, 2017, 01:53:59 PM »
We bought a top of the line Larson Davis LXT impulse DB meter, with a super expensive preamp/mic combo, capable of taking readings up to 190db. (if you are into sound, you know that number is pretty insane) So the question was, how loud are they. We all shot it naked, i.e. no moderator (once in a while) so we have a perception how loud it is.
Most DB meters of the shelf, and under $3-4K do not have the capability to accurately measure the impulse blast from a gun. So they do peak/hold/average within the duty cycle, around 1/60th of a sec.
To do impulse metering, you need it in the 20um range.....20 micro seconds. thats 0.00002 of a second....so very sensitive & accurate equipment.

I tested a FX Royale 500, .25 at high power (25gr at 930fps) - Tripped the meter at a whopping 118.5db (No moderator)
This was done with the muzzle 5ft (1.5m) above ground, and 3ft (1m) away from the meter. (Mil-spec)

I had my cheap db meter from Ebay laying next to it, just for giggles...it registered a measly 101db
« Last Edit: May 10, 2017, 02:36:08 PM by Windmeister »



Alan

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Re: How loud are modern PCP's ?
« Reply #1 on: May 10, 2017, 02:41:54 PM »
If my opinion means anything, you bought one of the best out there. I suspect few would spend the monies, but if you really want to know how loud a firearm is, this is the instrument. Using it on a PCP airgun is almost child's play. Congrats on doing it correctly.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

oldpro

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Re: How loud are modern PCP's ?
« Reply #2 on: May 10, 2017, 02:44:44 PM »
 Wow thats some serious equipment!!! Lucky!!!
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Christopher

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Re: How loud are modern PCP's ?
« Reply #3 on: May 10, 2017, 03:21:15 PM »
I don't know anything about the equipment you speak of, but it just sounds expensive! :) Will you be posting some more results of various air gun db's? If so, looking forward to it.

Chris
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Windmeister

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Re: How loud are modern PCP's ?
« Reply #4 on: May 10, 2017, 03:25:26 PM »
I will be as I get my hands on them:-)
Some in more detail than others.


Alan

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Re: How loud are modern PCP's ?
« Reply #5 on: May 10, 2017, 05:06:34 PM »
I don't know what he paid, and I won't say what I paid when I bought one for the company I used to work for. Suffice to say, I could buy one of the most expensive PCPs made for less money!
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Gerard

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Re: How loud are modern PCP's ?
« Reply #6 on: May 10, 2017, 05:25:46 PM »
What might be most useful to airgunners would be establishing a baseline sound pressure level chart for the most well known airguns in factory stock condition. For example a Marauder, a 2240, a popular springer such as the HW97, and perhaps an Airforce Condor. Just examples but you get my meaning. If you could set up an event where owners of a few of the more commonly used airguns could gather and test, compile a short chart showing average noise level and velocity with a given pellet weight, this could provide a very useful reference index for people shopping and trying tto decide based on loudness. If you further enhanced such a list with moderator/LDC type devices attached to the same airguns, testing a couple of the most common such as Huggett and TKO, this would provide quite a thorough illustration of what such devices deliver in noise reduction.

Not begging... just saying it seems never to have been done properly with airguns thus far. Firearms sure - NFAtalk has awesome lists of various firearms and ammunition with various muzzle devices attached and without. But the only airgun document I've seen on this subject apparently used a cheap SPL meter for the testing, as the numbers are absurdly low and plainly not accurate.
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rsterne

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Re: How loud are modern PCP's ?
« Reply #7 on: May 10, 2017, 05:37:30 PM »
All I can tell you is that my .257 Monocoque PCP is louder than a .22LR HV....  :o .... Mind you it's about 40% more FPE, too....  8)

Bob
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Windmeister

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Re: How loud are modern PCP's ?
« Reply #8 on: May 10, 2017, 07:36:25 PM »
Gerard: I would love to do that if time permits.
I know the local club has a bunch of rifles, various kinds, so maybe I'll bring it with next time and take some base readings.
AOA is in town as well, maybe I can talk Robert into do a wide spread test across his inventory.



Gerard

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Re: How loud are modern PCP's ?
« Reply #9 on: May 10, 2017, 07:53:55 PM »
AOA is in town as well, maybe I can talk Robert into do a wide spread test across his inventory.
Oh man, that would be seriously cool.
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Windmeister

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Re: How loud are modern PCP's ?
« Reply #10 on: May 11, 2017, 06:49:28 AM »
I did some testing on a couple of typical springers (not gas pistons) and were successful in isolating the mechanics only, for a reading, and it's a whopping 98-99db. I.e. you will not be able to get them any more quiet than that.

oldpro

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Re: How loud are modern PCP's ?
« Reply #11 on: May 11, 2017, 08:37:47 AM »
AOA is in town as well, maybe I can talk Robert into do a wide spread test across his inventory.
Oh man, that would be seriously cool.
ditto
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George Schmermund

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Re: How loud are modern PCP's ?
« Reply #12 on: July 29, 2017, 02:32:55 PM »
I've been looking into acoustical measurements that relate to muzzle noise from air guns. There is considerable information on the internet that has to do with measurements of firearms, but little that is useful for measuring airguns. The testing that I'm doing is posted on the GTA forum. Rather than double post here it's probably better to just post the link so that anyone interested in the real problems encountered when doing impulse measurements can draw their own conclusions. The link should put you on page 7 of the thread. The discussion about loudness starts about 1/2 way down the page.

https://www.gatewaytoairguns.org/GTA/index.php?topic=118339.120


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Alan

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Re: How loud are modern PCP's ?
« Reply #13 on: July 29, 2017, 05:29:54 PM »
Sound, like any wave, diminishes with distance, and in this case, the position (angle) from the muzzle. As a result, I don't put much stock in on-line published sound pressure levels. Also, the various types of suppression (how they're vented), if any, can further skew the results. Nonetheless, let up know what the results are.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.