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Post by SWAT A4 on Oct 11, 2004 0:33:07 GMT -5
.I got an idea for a mask, The big filher can be a fan, and the mouth part can be steel netting so u can talk but cant be shot in your mouth.... i want it.... i dont think anythgin like it is made.... i want it all plastic.. just a replica... that and the helmet would make the complete S.W.A.T. look., But of course in black. img.photobucket.com/albums/v294/swata4/GASMASK.bmp
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Wilycyt
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Post by Wilycyt on Oct 11, 2004 19:55:19 GMT -5
it would be cool, engeneering such a mask wouldnt be too hard if you had a gas mask to sarifice and the nessesary time/money/tools
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Post by silentkilla on Oct 11, 2004 21:08:17 GMT -5
If you think you can do it then power to ya.
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Post by DevilDog on Oct 11, 2004 21:10:06 GMT -5
Great idea.... They voice transmitter on the gas mask's suck.. Trust me!
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Post by Zorak on Oct 11, 2004 21:44:57 GMT -5
I'm not familiar with gask mask construction, but it looks like you could have difficulties putting a proper airsoft goggle lens into the eye holes. What do you envision doing?
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CarNic
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Post by CarNic on Oct 11, 2004 22:39:14 GMT -5
Well, they usually come with some pretty tuf lenses, don't they? I think they would provide more than enough protection from bb's, no problem...at least the ones we use at the fire dept.
I'm assuming you'll use an existing mask and not start from scratch.
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Post by Zorak on Oct 11, 2004 22:41:42 GMT -5
Given the stakes, I'd want to see some sort of impact certification, not just "pretty tough." I'm coming from the viewpoint of a team that hopes to host its own ops someday, meaning that if something went horribly wrong with you eye protection, we're the ones who'd get sued, beaten down by the press, blamed for new airsoft ban in MI, etc, etc.
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Post by Jacko on Oct 11, 2004 23:40:23 GMT -5
I think Snip looked into getting ANSI rated lenses for a specific respirator (Not sure which, might've been the M85) and he mentioned they were hard to find. However, after doing a quick search on Google, it looks like most respirators are ANSI rated.
That being said, I'm not the type to pay at least $125+ for something I'm going to tear apart and make into a glorified paintball mask. Respirators aren't cheap.
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Post by PathFinder on Oct 12, 2004 0:26:10 GMT -5
The depart of defense issues them to soldiers for chemical protection.Im not aware of the specs. on the new mask but i believe they are of a poly carb.orgin. Remember they have to face tuff standards (impact,chemical,a lot of stress of durability).As for after market ones you get what you pay for.Would you completly trust a face mask ment for paintball but used for airsoft?Realise that even Oakly has had problems the maker of ski goggels.
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Post by Zorak on Oct 12, 2004 0:53:17 GMT -5
Would you completly trust a face mask ment for paintball but used for airsoft? Absolutely. If it will take something as heavy as a paintball at 300 fps, I have no doubt that it will take a BB at 500fps. Let's see, impact energy is proportional to weight and the square of velocity. A paintball weighs a little over three grams. Even if someone was shooting 1g BBs, they'd have to be moving at 900fps to deliver as much kinetic energy as a paintball. Of course, paintballs break and BBs bounce, so the math isn't quite that simple, but then nobody I know uses anything heavier than a .36g BB, so I think I have a pretty good margin of error there.
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Mite
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Post by Mite on Oct 12, 2004 10:00:47 GMT -5
Seems like science week...
Zorak - Good job on the kinetic energy stuff, but actual impact pressures are going to be important. For that you need to estimate a few things 1) elapsed time overwhich the impact will occur (a very short time corresponds to a higher force) 2) Idea about how the impacted surface and the projectile deform during collision
Paintballs and bigger and deform more than airsoft BBs, so the pressure (pounds per square inch) exerted on the lens will be lower at similar energy levels. Same kinetic energy, but more surface area to spread it out over and a longer impact duration due to deformation (more time to decelerate the paintball). The ultimate stength of a material is based on pressure (stress) not pure force.
Give me something small enough in diameter and I bet I can make it penetrate the goggle lens with only 1 J of energy.
This is one reason why some dual "thermal" lens designs have difficulties when struck by a BB versus a paintball.
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Post by Munin on Oct 12, 2004 10:32:30 GMT -5
True. That said, most gas masks that I've seen have lenses that are like a quarter-inch of lexan (much like Bolle goggles). I'd actually be more concerned that the lens would pop out of the rubber housing than that the lens would shatter or spall.
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Mite
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Post by Mite on Oct 12, 2004 10:42:31 GMT -5
I think the ANSI spec is satisfied by 2.2 mm of solid polycarbonate. Anything more than that is a safety bonus. Mite <edit> Quick websearch turned up: www.shieldseyewear.com/safety_glasses.html</edit> <more edit> Bolle T-800 have a 2.2 mm thick lens </more edit>
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Post by PathFinder on Oct 12, 2004 11:40:06 GMT -5
Hell when i was in there wasnt any issue on eye protection.But most of us wore Gargoyles.Was the only only eye protection authorized by the Army at the time 92-95.
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Post by DevilDog on Oct 12, 2004 12:08:01 GMT -5
Wiley-X's are the prescribed eyewear now due to it's 2.0mm ballistic lens....
With the M40 type Gas Mask there are two lens. One that is changeable, one that is not. You can also get prescription inserts for them.
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