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Handheld PC *youtube*

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Handheld PC *youtube*

Unread postAuthor: Carlman » Mon Jan 28, 2008 12:04 am

Hi all,

I dont know if this has been shown here or not

[youtube]http://www.youtube.com/watch?v=73vuk77JMZ0&feature=related[/youtube]

Does anyone know what valve that is, ive never seen one on here or anywhere before

thanks.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 28, 2008 12:18 am

If I got it correctly, it's a butterfly type valve actuated by a spring.
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Unread postAuthor: MrCrowley » Mon Jan 28, 2008 12:21 am

Looks like a butterfly valve with the handle removed and rigged up for spring actuation.

Like a ball valve with a spring to open the handle, except this appears to be a butterfly valve and the handle is removed as you usually have to squeeze them and then turn.

Edit: God damnit, beaten by JSR. What are you doing up this early anyway JSR?
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Unread postAuthor: Carlman » Mon Jan 28, 2008 12:29 am

yea i cudn't quite catch the audio when he was saying what it is, it seems to have a fair bit of power aye?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 28, 2008 12:31 am

MrCrowley wrote:What are you doing up this early anyway JSR?


I usually wake up early at around 5:30 to get some online time before work, then I'm usually at work 6:30-7:30, the earlier I start then the earlier I can get home ;)
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Unread postAuthor: SpudFarm » Mon Jan 28, 2008 10:44 am

mabe i got an idè of what to do wih the propane tank :D
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Unread postAuthor: potatoflinger » Mon Jan 28, 2008 6:21 pm

Wow, that's one sick cannon!
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Unread postAuthor: DYI » Mon Jan 28, 2008 6:45 pm

I'm almost sure that the valve is a butterfly valve, with spring actuation, like JSR and Crowley said.

And it's nice to see that someone outside of this site is able to make a proper cannon. Chamber volume was excessive, but it didn't suffer from the usual Youtube cannon problems of choked flow, short barrels, and slow valves.
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Unread postAuthor: potatoflinger » Mon Jan 28, 2008 7:12 pm

It actually seemed like a pretty nice cannon, I think he said he was using a Ford hood spring as the actuator, I may have to look into that...
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Unread postAuthor: iknowmy3tables » Mon Jan 28, 2008 7:19 pm

I really want to know how he made that chamber I'd like a premade metal chamber with a large opening
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Unread postAuthor: Carlman » Mon Jan 28, 2008 7:30 pm

The chamber is a large propane bottle like for use on BBQs. He probably welded a large pipe on the front with a flange to accept the valve.
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Unread postAuthor: Hotwired » Mon Jan 28, 2008 7:55 pm

The action seems pretty nice.

I'm digging the use of a bike brake lever to release the loaded butterfly valve, I only look for finger lever triggers on small cannons, scaled up, a bike lever is perfect for a beastie like that ^_^
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Unread postAuthor: mopherman » Tue Jan 29, 2008 8:23 pm

Looks great, butterfly valve must have cost a bundle. i do object ,however, to the excessive chamber volume and the dude sticking his hand in the barrel of a charged cannon. looks pretty sweet with the handbrak trigger though
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