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Old March 17th, 2010, 19:34   #1
ThunderCactus
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About suppressors

Okay so the mainstream accepted knowledge here is that suppressors reduce your AEG's fps.
Somebody want to explain to me the physics behind that? Because it just doesn't make sense to me in the slightest.... Is the air normally denser in the suppressor than it is outside? lol
Like, how do you know your BB just hasn't SLOWED DOWN by 10fps over the 6" length of the suppressor?? It's definitely not accelerating in there since there's no compression...
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Old March 17th, 2010, 19:44   #2
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IMO, a suppressor decreasing FPS is pure nonsense! /thread.
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Old March 17th, 2010, 19:47   #3
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I have never heard of this bro. I have used the same set up on my SR since I got it, and I'm using a PSG1 length barrel covered by a silencer. No fps reduction.
I also have a silencer/suppressor on my APS2, and with or without it installed the APS2 shoots the same fps.

But the only thing I could possibly think of that would affect the fps is that if the barrel length is matched to the cylinder, there is no ported piston head, and you install a barrel extension silencer/suppressor, is that you might end up with suck back on full auto....if the inner diameter of the barrel extension is the same as the inner barrel of the AEG. But even then, you are talking extreme odds of this happening.

So yeah, could someone explain the physics behind this "main stream" thinking??

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Old March 17th, 2010, 19:58   #4
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Pure BS.
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Old March 17th, 2010, 20:00   #5
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Are these mainstream people thinking somehow the cans are like the real ones? That they are baffled to bleed off pressure so the BBs get slowed down to subsonic speed?

I think we all know how wrong that would be.
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Old March 17th, 2010, 20:07   #6
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Never heard this rumour before...

... and I know it definitely isn't true.
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Old March 17th, 2010, 20:13   #7
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Fuck now that's one for Mythbusters...Pure and utter BS IMHO.
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Old March 17th, 2010, 20:29   #8
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There used to be at least 2 guys in every thread about a suppressor that would say it decreases fps
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Old March 17th, 2010, 20:33   #9
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Re: About suppressors

You can safely call them retarded and link to this thread.
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Old March 17th, 2010, 20:35   #10
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Back when I had such things, I noticed about a 5-10 fps drop when I put a SOCOM silencer on a stock MP5K. I chalked it up as the silencer acting as a barrel extension, or perhaps to any sort of turbulence created by the open foam cells. Who knows, who cares really.

If you quiet your gun considerably and it costs 5 fps, it was worth it.

I doubt you would see any losses with a gun shooting 400 fps, but 250 fps is a tad different.
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Old March 17th, 2010, 20:58   #11
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Quote:
Originally Posted by mcguyver View Post
Back when I had such things, I noticed about a 5-10 fps drop when I put a SOCOM silencer on a stock MP5K. I chalked it up as the silencer acting as a barrel extension, or perhaps to any sort of turbulence created by the open foam cells. Who knows, who cares really.

If you quiet your gun considerably and it costs 5 fps, it was worth it.

I doubt you would see any losses with a gun shooting 400 fps, but 250 fps is a tad different.
right there^ just air turbulence on low fps guns. Also often it doesn't line up perfectly, so it makes sense. Its not more then 5 FPS (I assume) really just people trying to sound right because they have knowledge of what happens with real weapons.
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Old March 18th, 2010, 08:52   #12
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First I've heard of this too. Only way my mind can picture it is from the air displacement to the sides of the BB not being able to expand as normal due to the suppressor, so the air in front of the BB compresses a slight bit thereby slowing it down a touch.

I'd call it bullshit too. Lol
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Old March 18th, 2010, 09:21   #13
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Never heard of that.

I've gotten different FPS chrony readings by moving the tip of the inner barrel back and forth away from the chronograph (i.e. by having/not having a flash hider on, having/not having a suppressor on). It is the Madbull blue chronograph, it is within it's range of error anyways, it's not significant.
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Old March 18th, 2010, 13:29   #14
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Quote:
Originally Posted by ThunderCactus View Post
Okay so the mainstream accepted knowledge here is that suppressors reduce your AEG's fps.
Somebody want to explain to me the physics behind that? Because it just doesn't make sense to me in the slightest.... Is the air normally denser in the suppressor than it is outside? lol
Like, how do you know your BB just hasn't SLOWED DOWN by 10fps over the 6" length of the suppressor?? It's definitely not accelerating in there since there's no compression...
Ummm...most of the vets here have never heard of this. Where did you get that impression?
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Old March 18th, 2010, 18:12   #15
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I've seen it at least 10 times, on this forum and MAA forums
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