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valveless barreless soda bottle

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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valveless barreless soda bottle

Unread postAuthor: iknowmy3tables » Wed Aug 08, 2012 8:58 pm

gentlemen it's been a several years since I've last posted about a project in the works, but I was browsing this thread and some of the talk about special valveless rod projectile launchers reminded me of an old soda bottle rocket launch system I created when I was a TA for a shop class in high school. the launch system was just a schrader valve in a soda bottle cap with the walls slashed so the the cap would be held together with a pipe sleeve and a system to push the cap out of the sleeve so it would release the bottle. It occurred to me that this same system could act as the air seal and the the detent for a launcher similar to the grappling hook launcher kydavies is planing
so I created this prototype (pictures below)

I forgot to take pictures before the first test shot and as you can see the projectile likes to break itself on impact, luckily enough of it was intact for a second launch that I got on video


TL:DR WATCH THIS VIDEO OF ME EXPLAINING IT


so plus side is that this pretty much costs nothing to make and is only the size of a bottle, but the projectile has a short lifespan and takes time to make, I plan on using this for launching a grappling hook and maybe a spear head
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2012-08-08_20-50-46_38.jpg
the launcher is triggered by sliding the sleeve forward
Last edited by iknowmy3tables on Thu Aug 09, 2012 4:28 pm, edited 1 time in total.

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Unread postAuthor: PVC Arsenal 17 » Wed Aug 08, 2012 10:45 pm

I love it. It reminds me of something I made last year.

This is begging for a proper quick-disconnect firing mechanism.
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Unread postAuthor: iknowmy3tables » Wed Aug 08, 2012 11:34 pm

the rod is acting as a sort of inside out barrel so to achive the same performance with a quick connect you'd need to make a custom quick connect with a large diameter sealing surface and long enough to extent into the chamber
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Unread postAuthor: iknowmy3tables » Thu Aug 09, 2012 4:30 pm

I'm not sure how well I explained all that so I made a short video to summarize it

also @PVCArsenal would you consider this a neater disconnect system
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bottle trigger.PNG (35.01 KiB) Viewed 821 times

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Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2012 11:47 pm

iknowmy3tables wrote:also @PVCArsenal would you consider this a neater disconnect system


I say just use commercial quick connects ;) available forpeanuts on eBay.
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Unread postAuthor: iknowmy3tables » Fri Aug 10, 2012 8:32 am

jackssmirkingrevenge wrote:
iknowmy3tables wrote:also @PVCArsenal would you consider this a neater disconnect system


I say just use commercial quick connects ;) available forpeanuts on eBay.

a standard quick connect can't do the trick, the cross sectional surface area is too small and it can't accommodate the necessary rod that acts as an inside-out barrel
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Unread postAuthor: jimmy101 » Sat Aug 11, 2012 1:38 pm

The release mechanism looks very similar to a "Clark Cable" launch mechanism used in home brew water rocket launchers.

Image

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Unread postAuthor: iknowmy3tables » Sat Aug 11, 2012 3:18 pm

I remember this system, I made this type of launcher too when I was a tech ed TA, I had to machine the oring grooves with a miter saw
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Unread postAuthor: Gun Freak » Sat Aug 11, 2012 6:26 pm

Hey this is really cool... I think I'll try to make something like it :D
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