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Brplatz and Sddds13 new 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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Unread postAuthor: Lentamentalisk » Sun Jun 22, 2008 7:10 pm

epoxy=superglue
epoxy is a super glue.

as for the fueling/ignition issue, don't listen to spudfarm. just put your fuel in first, and then turn on the air. The air will be flowing in much faster (and way more of it) and will create a ton of turbulence, thus mixing your fuel. If there is any less fuel near the spark plug, that will change quickly, as the air will be swirling around, and will also diffuse fairly quickly.

edit: Oh ya, also, DDT is unlikely if you use and air/propane mix, but could be getting dangerous with an oxy/propane mix because of your (I am assuming) skinny, long barrel.
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Last edited by Lentamentalisk on Sun Jun 22, 2008 7:15 pm, edited 1 time in total.
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Unread postAuthor: SpudFarm » Sun Jun 22, 2008 7:14 pm

it is just a guess from my side..

it is a pretty darn fast "bottle neck" and i was thinking it took a while before it got there
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Unread postAuthor: DYI » Sun Jun 22, 2008 7:48 pm

Unless you actually go to all the trouble of purging the chamber of any inert gases before you fuel, I can't see detonation being a problem in that chamber with oxy/propane at the mixes you're talking about. Even at 20x, there'd still be about 13% nitrogen left. It seems as though even a small percentage of buffer gas can make the crucial difference.

I say that because my ME20H-41 has the same diameter chamber, almost 3 times as long, and has fired more than 20 oxy/fuel mixes, with two at 20x, and most at 10 or 12x. If it had detonated a significant amount of fuel on a few of those shots, I'd have noticed it by now.

I'm not saying to stand beside it when you fire it, just that it probably will hold together fine with oxy/propane. Just stay away from acetylene.
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Unread postAuthor: brplatz » Sun Jun 22, 2008 9:11 pm

So the epoxied barb/sparkplug will work ok. And it will mix like i thought with diffusion and all. I heard about purging the chamber and such but isnt that only neccesary with oxy/propane or oxy/MAPP mixs? For now its just Air/Propane and will be that for a while!

Acetalyne = Boom
Sddds13 has some nice experience with that :D
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Unread postAuthor: sddds13 » Sun Jun 22, 2008 9:33 pm

I love my micro acetalyne cannon. Nothing like a tennis ball catching fire and flying 250+ yards.
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Unread postAuthor: brplatz » Sun Jun 22, 2008 10:46 pm

yes that is quite fun! flaming tennis balls + desert is bad though
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Unread postAuthor: sddds13 » Mon Jun 23, 2008 7:26 pm

UPDATE: Ignition Coil will be installed thursday. Wiring is complete (except coil) and damage pics should be up on thursday or friday. Video and pictures will soon follow. Any ideas of what you would like to see get destroyed please tell us.
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Unread postAuthor: SpudFarm » Mon Jun 23, 2008 7:44 pm

sddds13 wrote:. Any ideas of what you would like to see get destroyed please tell us.


what about that extremly mad making avatar?

or a two by four
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Unread postAuthor: brplatz » Mon Jun 23, 2008 8:19 pm

Because sddds13 thought it was hilarious,

those 330v capacitors give a NASTY shock when you touch them fully charged! i really tossed that camera flash! Just for everyone else be careful cause i nearly s@#$ my pants :D
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Unread postAuthor: sddds13 » Mon Jun 23, 2008 8:39 pm

If you want real fun break the capacitors off the board and then charge them. Then throw them at someone. LOL there reaction will be to catch it and BAM you shock them crazy good. Altho they may kill you after. Buy a small capacitor from radioshack.
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Unread postAuthor: SpudFarm » Mon Jun 23, 2008 8:43 pm

i passed out from a camera cap dumped into a ignition coil (twice)
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Unread postAuthor: brplatz » Mon Jun 23, 2008 9:36 pm

now that sounds really bad. i wear my pvc insulated gloves from now on!
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Unread postAuthor: sddds13 » Mon Jun 23, 2008 9:55 pm

spudfarm wrote:i passed out from a camera cap dumped into a ignition coil (twice)


That is why you never want to build cannons naked. lol that would be a bad sight for anyone.

Especialy if you had many 3/4 holes cut into potatos. lol they may think something is going on.
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Last edited by sddds13 on Mon Jun 23, 2008 10:16 pm, edited 1 time in total.
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Unread postAuthor: daxspudder » Mon Jun 23, 2008 10:14 pm

During maintenance on my sub(marine not woofer), we often take charged capacitors and toss them to each other, it really is a lot of fun... if your the one throwing it...
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Unread postAuthor: THUNDERLORD » Mon Jun 23, 2008 10:56 pm

Those camera flash caps are no joke.
One got me one time while ripping the plastic cameras apart, my jaw went MMMmRRR!! Then I kind of laughed cause it was inevitable.

I was thinking of making a flashy blinding light(s) contraption to add to the muzzle end of a home defence type something for night time use.

Or add a red lense for simulated muzzle flash for some cool toy gun.

Back on topic, nice Hybrid, hope to see finished pics/info. 8)
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