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auto-piston v4.0 - the bullpup

A place to ask general spud cannon related questions.
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Unread postAuthor: POLAND_SPUD » Fri Jan 04, 2008 6:20 am

JSR would it change anything...? I think that the piston would open only a little and air would leave this valve immediately... there wouldn't be much time for pressure to act on that greater surface of the piston and to move the piston up.... air would just leave without actually openning the valve more....


don't you think that this would be a problem ?
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 04, 2008 6:29 am

I was thinking about this, perhaps it would help if the position of the side vent could raised sufficiently for it to be blanked off by the piston until it starts to move.

Still, commercial pop-off valves seem to operate without this restriction...

Image
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 10, 2008 12:02 am

After a flurry of activity regarding auto-pistons, the discussion seems to have died down somewhat - however, our very own Brian the brain has designed something similar and made it work :D

Following my string of failed prototypes, I find this very comforting and might just be inclined to build one more :)
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Unread postAuthor: SPG » Thu Jan 10, 2008 11:16 am

Ah, yes I died down a bit on this because I've been at the sales !!!!

Oh and also I've been looking at real world fittings and bits and pieces to see how I could actually make one of them. I'm not going for the pop-off valve look though, as I want to valve and feed system connected.

Also I reckon with the addition of a spark plug the design we've got on this thread will make a truly great auto-hybrid, which is my Holy Grail.
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Unread postAuthor: Hotwired » Thu Jan 10, 2008 11:27 am

SPG wrote:Also I reckon with the addition of a spark plug...


:?:

This is still a pneumatic project isn't it?
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Unread postAuthor: SPG » Thu Jan 10, 2008 11:46 am

Well, it started as one, but if you look at the deisgns on page 1 again, they're just the type of thing which would work for a hybrid. In fact there's no reason why it couldn't be both when you look at it.

So, yes it is a pneumatic, but yes it is also a hybrid (perhaps).
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Unread postAuthor: Brian the brain » Thu Jan 10, 2008 1:11 pm

I removed the picture of my "snapvalve" in hope of one day selling 'em in Holland.

I'll still help out anyone here to build one or a valve similar to it.
Just that from now on I don't want any newbies ( esp. from Holland) to see it.

Most of you interested in this subject have probably seen the diagram anyway and have understood how it works in one glance..right??
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 10, 2008 1:28 pm

No worries, we got the idea ;) after all, we had arrived to the same conclusion, but it was nice to see it tested and functioning :)
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Unread postAuthor: Hotwired » Thu Jan 10, 2008 1:38 pm

Haha, everyone has something too precious to share.

Dammed if I post the technical diagrams for my next launcher. After slaving over them for the machinist, any other bugger wanting the same can get out their own drawing kit and brain :P
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Unread postAuthor: Brian the brain » Thu Jan 10, 2008 1:43 pm

When your project fails....do you know I ship orders too ( hahaha)
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: ALIHISGREAT » Thu Jan 10, 2008 1:58 pm

Hotwired wrote:Haha, everyone has something too precious to share.

Dammed if I post the technical diagrams for my next launcher. After slaving over them for the machinist, any other bugger wanting the same can get out their own drawing kit and brain :P


and i thought the real meaning of spudding was to teach us all how to share :D
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Unread postAuthor: Hotwired » Thu Jan 10, 2008 2:04 pm

Yes, and I'll share the principles of how it works :)

The dimensioned diagrams for the machine shop ain't going within 50cm of the internet. It would be further but the computer takes up a lot of desk space...
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Unread postAuthor: ALIHISGREAT » Thu Jan 10, 2008 2:09 pm

Hotwired wrote:Yes, and I'll share the principles of how it works :)

The dimensioned diagrams for the machine shop ain't going within 50cm of the internet. It would be further but the computer takes up a lot of desk space...


haha lol maybe if someone was to inquire about the cost of said planned gun and maybe they would find it would be within their budget and suppose if they wanted to make it would you maybe sell the plans?
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Unread postAuthor: Hotwired » Thu Jan 10, 2008 2:32 pm

Doubt it, but ask me again in a few months when it should be made :)
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Unread postAuthor: ALIHISGREAT » Thu Jan 10, 2008 2:36 pm

Hotwired wrote:Doubt it, but ask me again in a few months when it should be made :)


are you saying it will be out of my budget or you won't sell plans :?

although it probably will be out of my budget, my piston valved marble cannon will come to over £100 :cry: and to use it to it's full potential i need to make a pump aswell :( although i will have some of the pipe for that leftover i suppose...
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