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Slow motion camera + GBB

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Old February 13th, 2008, 23:30   #1
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Slow motion camera + GBB

i've always wanted to see what happens

YouTube - Airsoft GBB slow motion

YouTube - Airsoft GBB slow motion 2

hope its not a repost. enjoy.
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Old February 13th, 2008, 23:33   #2
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nice find. Hicapa is hawt
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Old February 14th, 2008, 00:02   #3
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!!!SEXYTIME!!!
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Old February 14th, 2008, 00:20   #4
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That's about as fast as a GBB on duster performs !!!
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Old February 14th, 2008, 00:23   #5
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was always wondering if koba's 'pre shoot' system really resulted in zero slide movement until the bb leaves the barrel

looks like a few miliseconds before the bb leaves the slide starts to shimmy just very slightly
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Old February 14th, 2008, 00:24   #6
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Finally... neat stuff.
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Old February 14th, 2008, 01:25   #7
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sweet

video = sexy time
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Old February 14th, 2008, 01:32   #8
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thead jack, who wants one of these? (Group order perhaps?)

YouTube - P-90 rubberband edition gun
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Old February 14th, 2008, 01:58   #9
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Black and white and grainy...would be nicer if someone had access to the new Casio camera. Can take 6MP pics at 60fps and digital video at up to 1200fps, normal TV broadcasts and such are usually 26 or 29 point something fps.
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Old February 14th, 2008, 02:00   #10
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Very interesting videos. Video two appears to show the slide recoiling before the bb leaves the barrel. There may be a case for stretching the reed valve spring a bit to retard the blowback phase a bit to space out the fire and recoil phases more.
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Old February 14th, 2008, 19:57   #11
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Quote:
Originally Posted by Shinjin_MC View Post
was always wondering if koba's 'pre shoot' system really resulted in zero slide movement until the bb leaves the barrel

looks like a few miliseconds before the bb leaves the slide starts to shimmy just very slightly
That's essentially how almost all modern GBB's work: The cycling process doesn't actually begin until the projectile leaves the barrel, at which point a negative pressure is created in the barrel, causing the floating/rocket/reed valve to close and transferring the gas to the blowback system.

Real steel is based on a similar system.

Neat video, though. Good to see that the system functions as theorized.

Last edited by ILLusion; February 14th, 2008 at 20:00..
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Old February 14th, 2008, 20:02   #12
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So does this mean reports of enhanced recoil spring resulting in increased fps are flukes or misunderstandings?
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Old February 14th, 2008, 20:07   #13
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Quote:
Originally Posted by Shinjin_MC View Post
was always wondering if koba's 'pre shoot' system really resulted in zero slide movement until the bb leaves the barrel

looks like a few miliseconds before the bb leaves the slide starts to shimmy just very slightly
Just like real guns...
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Old February 14th, 2008, 20:33   #14
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So does this mean reports of enhanced recoil spring resulting in increased fps are flukes or misunderstandings?
Yeah, whoever says that has no idea what they're talking about, unless they're using an OOOOOOOOLD classic GBB system that fires gas in to both areas of the gun at the same time. I haven't seen a gun do that since MGC's guns back in the late 80s/very early 90s.
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Old February 14th, 2008, 21:47   #15
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Actually almost every GBB partially pressurizes the blowback mechanism before they snap into recoil mode. Only Magna GBBs have a distinct pressurization of only the breech or recoil pneumatics. Even recent TM GBBs have a mid station reed valve which snaps forward. In the rearwards position, gas pressure is applied to the recoil assembly. If it didn't, there would be no pressure to shove the reed valve forward when breech pressure dropped.

If that video is of a TM hicapa, I'd say that the reed valve wasn't stiff enough. It looks like the slide starts its recoil just before the pellet exits the barrel in the 2nd video.
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