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X-1.1 Mach speed airsoft bb experiment

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X-1.1 Mach speed airsoft bb experiment

Unread postAuthor: Gippeto » Mon Dec 01, 2008 9:52 pm

This is my "little project" that I've been working on for the last few days.

Very much inspired by JSR's experiments which were "knocking on the door" of mach 1.

Specs;

Barrel: 36" of 9/32" .014"wall brass tube

Chamber: 6" (interior length) of 3/4" Type M copper

C:B of 1.5:1

Co-axial piston machined from nylon, with a teflon sealing face and floating o-ring seal

Pilot assembly: "Borrowed" from my copper gun. Features a modded blow gun, and an improvised probe style fill.

I have been using my home made stirrup pump with this thus far. Reaching pressures of 400psi.

I am using .12 gram airsoft bb's

According to wikipedia, the speed of sound in air @ 20C is 1125fps.



Edit: And according to my chrony (used properly this time), I'm not there.

A peak velocity of 1059fps was recorded for the airsoft bb @ 5 feet from the muzzle.

http://www.youtube.com/watch?v=UbnBsAt28Hc
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Attachments
Disintegrated bbs.JPG
Holes in target.JPG
Piston face.JPG
Piston close up.JPG
Exploded view.JPG
The launcher.JPG
Last edited by Gippeto on Wed Dec 03, 2008 11:57 pm, edited 4 times in total.
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Unread postAuthor: SEAKING9006 » Mon Dec 01, 2008 9:56 pm

Can't wait for a confirmed >Mach 1 shot. Tough, wouldn't it be better with a bigger chamber and longer barrel? (Just guessing)
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Unread postAuthor: Ragnarok » Mon Dec 01, 2008 10:31 pm

I'm getting a dead result for the video link, but that might be because Youtube's about to undergo maintenance.

I wouldn't personally call this a mini, too long in my opinion - I think of it more as pistol sized, but if you prefer...

Looks nice and shiny. What range were you shooting that target at? 'Cos that ain't a bad group. (EDIT: Saw the video. This last comment no longer applies)
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Last edited by Ragnarok on Tue Dec 02, 2008 6:22 am, edited 1 time in total.
Does that thing kinda look like a big cat to you?
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Unread postAuthor: Davidvaini » Mon Dec 01, 2008 10:40 pm

you should try to shoot some .20g bbs.. id really like to see the fps difference at such a higher end of the FPS scale..
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Unread postAuthor: SEAKING9006 » Mon Dec 01, 2008 10:43 pm

Better yet, throw some graphite-coated .40's up in that sucker. :wink:
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Unread postAuthor: jor2daje » Mon Dec 01, 2008 11:04 pm

This is a beautiful gun just wondering what sort of lathe you used for the piston I really want to get one and Im not sure which are any good.
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Unread postAuthor: Davidvaini » Mon Dec 01, 2008 11:29 pm

well the reason why I say .20 airsoft BBs is because that is the general standard for airsoft use.. not saying they would allow a 1200fps gun in airsoft.. but still.. nice to use the standard..
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Unread postAuthor: FordGtMan » Mon Dec 01, 2008 11:50 pm

Dang, that piston looks nice. If you really want good power and accuracy take some .22 pellets and widen the flare with JSR's technique. I know this is a gun to shoot "airsoft", but it would be cool to see some power shots. Your defiantly going to have to do the coin challenge with this, although it wouldn't be a problem. Its tradition with all minis i create. :D
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Unread postAuthor: starman » Tue Dec 02, 2008 1:28 am

Beautiful work as usual Gippeto. Simple and elegant. Looking forward to some operation/damage video.

Supersonic will be awesome... 8)
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Unread postAuthor: MrCrowley » Tue Dec 02, 2008 1:58 am

Damn, people need to stop making cannons that I really like...I spend enough on this hobby as it is, and each time I see an awesome cannon, I want one just like it, but better :P

Great work again!
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Unread postAuthor: Davidvaini » Tue Dec 02, 2008 2:12 am

MrCrowley wrote:Damn, people need to stop making cannons that I really like...I spend enough on this hobby as it is, and each time I see an awesome cannon, I want one just like it, but better :P

Great work again!


you should make a version of one of my BDC.. but make it better.. im sure you could make it better some how..
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Unread postAuthor: ALIHISGREAT » Tue Dec 02, 2008 2:47 am

as i have come to expect from Gippeto, its a nice looking, well put together and good performing cannon :wink:
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Unread postAuthor: POLAND_SPUD » Tue Dec 02, 2008 2:54 am

using helium on this should help to increase fps a little bit... it's just a suggestion
:D
nice gun gippeto
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 02, 2008 5:16 am

Extremely well made, kudos :D

What's really interesting that you seem to be getting better performance than I was getting for a burst disk, using similar proportions, pressures etc. - could you try it out with the muzzle a little further from the chrony to see if it makes a difference?

I also second the suggestion that you should try some lead ammunition, get your hands on some medium weight 0.25" pellets :)
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Unread postAuthor: VH_man » Tue Dec 02, 2008 6:14 am

that. Piston. Made. Me. Need. Paper. Towels.

How did you make such a bloody beautiful Item?

that and, For gods sake, Shoot a full can of seltzer water. You will be suprised. And catch it on video.

That and what is that fill thing your using? Ive never seen it before.

Im envious on the sexyness of this cannon.
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