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750 fps marble launcher

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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750 fps marble launcher

Unread postAuthor: Anatine Duo » Mon Feb 06, 2017 7:55 pm

Not ready for showcase yet... thought I'd post this now and maybe get some inspiration on how to finish this guy.

Short story: This is the Bullshark, rebuilt in bits from my MK 2 back in 2003, standard piston valve muzzleloader, .64 cal currently shooting marbles at 240psi. Overall length 38" , overall weight under 5 lbs, mechanically triggered

I'm quite proud of the pilot valve that I call the "Liftoff" valve (hopefully I can get these pics to work)

Chrono shows 630fps @150 psi with marble, 430 fps @200psi with 5/8" steel bearing

Since getting the pilot to stop leaking it has been awesome@240psi (that's as high as my bicycle pump goes) but it was snowing too hard to get the chrony out... data and video to come...

More of the story... part of the rationale behind the design of this launcher was to use as few plumbing parts as possible. The Liftoff pilot can be made of very basic materials. The pressure tube is ABS DWV but before the obligatory safety warnings get posted, it has 3 layers of Kevlar wrapped around it in aircraft laminating epoxy (plus 2 layers glass sanding veil)
The stock has minimal inletting, as all the mech is in one plane. Trigger has to be mechanical for me... originally I piloted this thing with a schrader at the end of a tube but I learned to shoot on real triggers and hate mushy valve triggers.

It's a "no excuses" sort of build... Any smooth tubes, scrap schrader, plus some gumption can be the basis for a similar build. I did have access to a lathe briefly so the end plugs are machined, but nowadays I would probably cast them from epoxy with additives.
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bullshark liftoff open (3).jpg
bullshark wip 2.jpg
Last edited by Anatine Duo on Sat Feb 18, 2017 2:54 pm, edited 3 times in total.
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Re: marble launcher bullpup

Unread postAuthor: jrrdw » Tue Feb 07, 2017 6:33 am

Stain the stock. A nice dark cherry or mahogany looks good...
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When life gives you lemons...throw them back they suck!
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Re: marble launcher bullpup

Unread postAuthor: farcticox1 » Tue Feb 07, 2017 5:00 pm

I like it :bounce:
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Re: marble launcher bullpup

Unread postAuthor: Anatine Duo » Wed Feb 08, 2017 9:42 pm

Some 240psi damage video:
Better pic (not sinking in snow)

bullshark with pump small.JPG


The wood definitely needs some colour, but I'm not happy with the quality so it will probably get paint. Needs a trigger guard... so sketchy without.

Needs ramrod holder.

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Last edited by jrrdw on Fri Feb 10, 2017 8:13 am, edited 1 time in total.
Reason: Embedded video.
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Re: marble launcher

Unread postAuthor: nik282000 » Sat Feb 11, 2017 10:14 pm

Awesome, it takes a lot of force to poke a hole in a hard hat.
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