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ME20H-41, by DYI

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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Unread postAuthor: Pyro Ninja » Tue May 13, 2008 2:10 am

Very nice, Love the power, expecially for such a short(ish) barrel :D
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Unread postAuthor: VH_man » Tue May 13, 2008 5:40 am

you do realize supersonic golfballs have the same muzzle energy as some anti-aircraft rounds.................

anyway, im proboably going to build a gun off of your "meter" design. i like it alot.

and that 20X mix......... HOLY F*** that was insane........... you did need a thicker burst disk though.
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Unread postAuthor: psycix » Tue May 13, 2008 6:39 am

Ah you finally posted it DYI :D
Its as impressive as I expected.
Will more vids come?
Exact muzzle velocities? :roll:
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Unread postAuthor: JDP12 » Tue May 13, 2008 7:21 am

wow... that thing is sick and awesome, nice job DYI
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Unread postAuthor: POLAND_SPUD » Tue May 13, 2008 8:36 am

this is madness :D

BTW we have to make Larda to pressure test some standard iron fittings to get the rough idea about their 'real' pressure rating :wink:
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Unread postAuthor: pat123 » Tue May 13, 2008 8:53 am

wow amazing :notworthy: . taking those fittings to 20x :shock: I am surprised that they stood up to that. I am definitely going to have to upgrade Biohazard. :wink:
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Unread postAuthor: bigbob12345 » Tue May 13, 2008 9:36 am

Wow I just realized those were malleable iron fittings, I didn't read through at first and assumed they were special high pressure ones.
Im very surprised that they held at 20x, Im also surprised that ddt didn't occur.
Well DYI, You really like to push the limits.
I thought using 500psi on the sctbdc was pushing the fittings but this is something else.
Nice job, I guess
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Unread postAuthor: Ragnarok » Tue May 13, 2008 2:53 pm

POLAND_SPUD wrote:this is madness :D

No. THIS IS SPUDFILES!!!

*Kicks Poland spud into conveniently positioned hole*

Very impressive DYI... If 20x oxy-propane doesn't detonate in 7 chamber diameters, we need a rethink of our detonation theories, although we should still be wary.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: daberno123 » Tue May 13, 2008 3:38 pm

It didn't blow-up, which is great, especially for Kevin, who doesn't have to give you his PS2 :D

That really surprised me that it didn't blow up because of a detonation, which would have seemed inevitable at these mixes. Seems the usual assumptions have been proved wrong.

This doesn't mean everyone should start putting 20x into their hybrids though, and just because this gun survived it doesn't mean everyone who tries it won't be killed.

Still, that was awesome, but not the safest thing to do :twisted:
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Unread postAuthor: paaiyan » Tue May 13, 2008 3:50 pm

:shock:

Wwwooowww.

Me likey. I want to see what that thing could do to a block of ballistics gelatin.
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Unread postAuthor: pat123 » Tue May 13, 2008 3:52 pm

yeah we need more damage pics. try shooting through 1" steel
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Unread postAuthor: drex » Tue May 13, 2008 4:03 pm

umm......... WOW. shoot some thing other than water plz. other than that awsomesweetsexycool
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Unread postAuthor: DYI » Tue May 13, 2008 4:36 pm

I got the epoxy to rebuild the sparkplug, and I did a bit of a redesign to (hopefully) prevent the problem of the entire guts of the sparkplug getting pushed out. The next one will have copper conductors. A 3000 psi rated forged steel union left Georgia on the way to Ontario last night, and hopefully a high pressure rated chamber is in the works as well.

The problem with shooting holes in thick steel is that you need harder steel to do it. I don't have the equipment yet to harden it myself, so I need to buy it. Where I live, that means center punches, which, at $8 a piece, aren't very affordable ammo. I'll try my luck against 1/4" plate with unhardened ammo, but I wouldn't get too excited about it, as this thing doesn't have much more muzzle energy than the SCTBDC did (although at a quarter the weight and a third the length, I think it's a pretty good trade-off).

I've got to work this weekend, but I'll try to take it out and get some shots on Monday. I can't really promise anything, and you have to remember that, at these pressures, I can never count on it surviving the shot.
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Unread postAuthor: clide » Tue May 13, 2008 5:19 pm

Did you happen to measure the pipe and fittings before and after the shots to check for plastic deformation?

Impressive gun although I must say a little bit insane. It's a bit of a shame that the 20x was just shot into the water.
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Unread postAuthor: DYI » Tue May 13, 2008 5:39 pm

There's a story behind the different position of the last shot that I'm not going to get into here, but the water was the best target we could find in the nearby area where we could still run the wires behind something sturdy.

As the look of the GHETTOPOD might tell you, this testing wasn't exactly done in a highly planned and controlled manner, so no, there aren't any measurements :roll:
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