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UPHL-38 (Updated 10/8/07)

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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UPHL-38 (Updated 10/8/07)

Unread postAuthor: SpudBlaster15 » Sat Sep 15, 2007 1:58 am

UPHL-38

Ultra powerful hybrid launcher 38 cubic inches

This is the final version of my hybrid launcher. Having tried everything from remotely ignited 4x propane/air, to hand held 4x MAPP/air, to remotely ignited oxygen/MAPP, I now have a superb understanding of what works and what doesn't; what is practical, and what isn't.

Oxygen is costly. Period. Far too costly to include as a major operating requirement of one's most frequently operated launcher. As a result, I have eliminated the oxygen metering system, and have replaced it with a traditional air inlet. My high pressure pump raises the chamber pressure 3psi with every pump stroke, which is quite ideal, and much less costly than oxygen.

Specifications

Chamber: Galvanized steel construction, 1.38" inside diameter, 15in<sup>3</sup> volume
Barrel: Copper construction, 0.787" inside diameter, 23in<sup>3</sup> volume
Loading/Burst disk holder: 3/4" galvanized steel union
Fuel: MAPP gas
Ignition: Electronic BBQ igniter, (the original) homemade 1/8" NPT spark plug
Mixes attempted: 4x, 5x, 6x (most commonly used), 7x
Burst Disks: Soda can material; 2 layers for 4x and 5x, 3 layers for 6x, 4 layers for 7x
Optics: Crosman 4x15 rifle scope
Estimated muzzle energy: 460ft/lbs for a 5 gram projectile, 510ft/lbs for a 10 gram projectile, 540ft/lbs for a 20 gram projectile, 550ft/lbs for a 30 gram projectile.
Estimated muzzle velocity: 1640fps for a 5 gram projectile, 1219fps for a 10 gram projectile, 890fps for a 20 gram projectile, 730fps for a 30 gram projectile.

Pictures

The launcher without a barrel.

Image

The entire launcher.

Image

Small diameter barrel VS Large diameter barrel.

Image

The modified union (taper removed, rubber washer CA glued in place, necessary for a seal at 6x)

Image

My current favorite ammo, a 12 gauge shell filled with steel BBs, used as shotgun type ammo. (The shell remains in the barrel while the BBs and wadding exit the barrel)

Image

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Video comparing my Hybrid to my Copper piston gun.

[youtube]http://youtube.com/watch?v=RxgX2W1FJKM[/youtube]
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Last edited by SpudBlaster15 on Tue Oct 09, 2007 12:46 am, edited 5 times in total.
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Unread postAuthor: Killjoy » Sat Sep 15, 2007 2:50 am

that is a thing of beauty. The fact is looks so much like a rilfe really sells it for me.
Shame the o2 thing didn't work out as cost affective, but clearly it doesn't matter very much.
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Unread postAuthor: spanerman » Sat Sep 15, 2007 3:50 am

Woow, when we thaught it couldent get any better......that barrel is the same lenth as mine but i think mine is slightly bigger, whats your ammo? mines C-Cell battery:D
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Unread postAuthor: windshrike » Sat Sep 15, 2007 8:04 am

Beautiful.......
wish I was allowed hybrid's I would totally copy your design.
Beautiful.
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Unread postAuthor: SpudBlaster15 » Sat Sep 15, 2007 2:11 pm

Thanks for the comments guys. I really do appreciate the kind words.

Spanerman: I usually fire AA batteries wrapped in tape, nail darts, and wooden arrows tipped with large nails.

I just added a video to the main post. It compares my Hybrid launcher and my Copper piston gun in their ability to destroy cans. Lets just say it isn't exactly a fair comparison. :lol:
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Unread postAuthor: phonut » Sun Sep 16, 2007 6:41 pm

Damn, a AA Battery going at around 560fps is pretty powerful. :twisted:











:)
Nice performance.
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Unread postAuthor: mark.f » Sun Sep 16, 2007 8:06 pm

Very nice. The fact you got a working hybrid rifle is impressive. Last time I tried that I wound up mounting mine on a wooden base and saying "screw it". :wink:
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 16, 2007 11:48 pm

VERY nice, though I think the comparison with the pneumatic is a tad unfair because of the dead space in the breech and the relatively low pressure you pump it to.
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Unread postAuthor: SpudBlaster15 » Mon Sep 17, 2007 12:06 am

The comparison with the pneumatic was more for laughs than anything, as a pneumatic launcher with a .545 caliber, 5 foot long barrel and a chamber pressure of 100psi is obviously going to look like a cap gun in comparison to a hybrid with a .787 caliber, 4 foot long barrel, and a chamber filled with gas at a pressure of 300psi and a temperature of close to 4000F.

The dead space in the breech of the pneumatic doesn't decrease performance noticeably.
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Unread postAuthor: Redcoat » Mon Sep 17, 2007 2:49 am

Can i ask, How long does it take to load the shot that you took from the hybrid that was equivalent to 400psi?

Including fuelling and loading the actual projectile.
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Unread postAuthor: SpudBlaster15 » Mon Sep 17, 2007 9:18 am

Around 45 seconds to a minute would be my estimate.
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Unread postAuthor: spanerman » Mon Sep 17, 2007 12:03 pm

yeah i just timed myselft at 52 seconds :D and no i have nothing better to do lol
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Unread postAuthor: Spudinator » Mon Sep 17, 2007 1:46 pm

Nice gun... but a waste of a good beer :P

Try and see if a shotgun wad fits inside of the barrel (get em in packs of 500 for a few bucks at gun stores), if it does, drill a hole through the middle of it (lengthwise) then thread a 3" wood screw through it, with the fins facing backward and the tip of the screw forward. Makes a nasty fast projectile, most excellent for hybrids, they usually go through plywood, and anything thicker they stick into (lol and dont come out because of the threads).
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Unread postAuthor: spud yeti » Mon Sep 17, 2007 1:59 pm

Shes a beauty. I love the compact rifle-like look to it (even if its a bit crazy :D )
Great work
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really good quote/phrase here
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Unread postAuthor: SpudBlaster15 » Thu Sep 20, 2007 11:12 pm

The original post has just been updated with new pictures.
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