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TBMA-230 Oxy/Propylene Piston Hybrid

Built a hybrid cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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What do you think?

AWESOME!
18
51%
Mildly interesting
2
6%
I'm scared
4
11%
I'm a pneub, go away hybrid supremacist
4
11%
Should have made a pengun instead
7
20%
 
Total votes : 35
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Unread postAuthor: Moonbogg » Wed Oct 06, 2010 1:59 pm

I found some cheap high pressure check valves from mc master that I used for the striker. I forgot the number, but search and you will find.
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Unread postAuthor: saefroch » Wed Oct 06, 2010 2:05 pm

A 1/2" check valve on McMaster rated to 1kpsi is $20.66. I'm pretty sure that the repeated combustion would damage the seals on those though.
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Unread postAuthor: whoa044 » Wed Oct 06, 2010 2:42 pm

SpudBlaster15 wrote:Clearly standard ball valves are unsuitable for use on high mix hybrids. I'm currently attempting to locate some high pressure hydraulic valves.


I have a 1" 2000psi rated ball valve. It cost $12.
Clicky

edit: It seems that you'd need to shell out a lot of money to get a hydraulic ball valve, unless if it's smaller than 3/8. Source: Ebay
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Unread postAuthor: SpudBlaster15 » Wed Oct 06, 2010 3:04 pm

New video is up.

[youtube]http://www.youtube.com/watch?v=EL9oNLsq8i8[/youtube]
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Unread postAuthor: Gun Freak » Wed Oct 06, 2010 4:05 pm

You could just build your own HP check valve.

NICE RECOIL!
LOL at the airsoft shot :D
You should have got footage of the recoil of the motor shot, I'd presume it was pretty substantial? That ball valve got destroyed, lol. Nice video!
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Unread postAuthor: SpudBlaster15 » Wed Oct 06, 2010 4:34 pm

I tried to capture the recoil of the motor shot, but I also wanted a closeup of the damage, so I tried to set the camera up such that the angle would give a decent compromise. Clearly I failed, but at least the damage shot itself looks good.

The recoil was pretty substantial, as sabot included, the round's mass was close to 200g. It felt pretty similar to the recoil from the steel BB shotgun round.

Those large ball valves fair very poorly with oxygen enhanced mixes, but the 1/2" ones seem to survive if their seal lubrication doesn't burn off. I'm hoping the current setup will solve all of the issues, but of course you've all heard that one before...
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Unread postAuthor: Moonbogg » Wed Oct 06, 2010 7:20 pm

That was great! Yeah, the oxy shots are brutal on anything thats not metal aren't they? It seems that the heat just frags everything in the chamber.
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Unread postAuthor: SpudFarm » Thu Oct 07, 2010 5:07 pm

AMAZING GRACE!!

Once more, good job! Next time - more distance to the target. Some "long" range shooting with and without target cam would be nice.

I really appriciate your videos, even though they keep pushing me towards building a new hybrid that can be used more practically.

Stunned again!
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Unread postAuthor: Lockednloaded » Thu Oct 07, 2010 9:17 pm

Haven't commented in this thread, but I've talked with you about it in the chat room, but still... ITS SUPER L33T AWSUM!@!

The barrel flex is pretty concerning even if you are using ABS, how about adding a muzzle brake to combat the flex?
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Unread postAuthor: SpudBlaster15 » Thu Oct 07, 2010 9:34 pm

Lockednloaded wrote:The barrel flex is pretty concerning even if you are using ABS, how about adding a muzzle brake to combat the flex?


I took a slightly different approach to combating the barrel flex.

Yes the launcher is sitting on my bed, cue the terrible jokes from POLAND_SPUD. :roll: :lol:
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Unread postAuthor: SpudBlaster15 » Sat Oct 09, 2010 7:36 pm

I managed to obtain a couple 3000PSI rated steel hydraulic ball valves today, so I should have this thing working reliably soon. Only cost a bit over $30 for a 1/2" and a 1" valve, so not a bad deal.
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Unread postAuthor: SpudFarm » Sun Oct 10, 2010 10:10 am

That barrel suport should work, however it wil also put enormous stress on your ball valve.

And to make it look better you can replace the air between the barrel and the support with thin aluminium plates.

Just my opinion :)
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Unread postAuthor: SpudBlaster15 » Sun Oct 10, 2010 10:41 am

That setup was just a temporary prototype, assembled to test the rigidity of the barrel with steel supports. The proper design uses a 1" steel ball valve, and applies significantly less torque to the ball valve and its threaded connections.
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Unread postAuthor: SpudBlaster15 » Mon Oct 11, 2010 9:18 pm

New pictures of the launcher are up. In addition to the 3KPSI rated chamber ball valves, there are a few new features, such as the return of the propylene fuel bottle, a new fuel pressure regulator, better quality ball valves all around, a new barrel support, and a 0-300PSIG pilot chamber pressure gauge.

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Unread postAuthor: JDP12 » Mon Oct 11, 2010 9:41 pm

holy cow. this thing is so impressive
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