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SB15's 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: CannonBall » Sat Jun 30, 2007 11:36 am

you say a small area? is 2000cc small? my hybrid has much less...
And piston movement... is like the disc bursting..
Im quite sure about ddt that its hard to let happen... I think you have much more chance if u would use pure O2..
If no one had a ddt ... then who came on this idea. if it hasnt been proven i don't believe it..... If im correct the water pressure hybrid used 7 times mix.. so where's the ddt?

My fittings ar all class 300.. 2000 psi.. is rated so burst presure is higher and thats for the hand held.. i want to try 7x at least. i will post it when i go above 5x mix 8)
Hope i live through :shock:
As for my 20x mix Hybrid (burst pressure 725 bar) thats like 11000 psi hope its enough.
Cheers
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Unread postAuthor: SpudBlaster15 » Sat Jun 30, 2007 2:08 pm

2000 cubic centimeters is the overall chamber volume of the motorcycle's engine. The volume in which combustion occurs is ~2000/14 = 143 cubic centimeters.

DR's generation 2 hybrid has the potential to reach a 5x mix, but I don't believe he has ever gone over 4x.

DDT has not been proven to occur, but to ignore it is utter stupidity. Should it occur, the massive pressure spike could rupture your Class 300 fittings, even though they are rated to a higher pressure than what detonation of a propane/air mix produces.

Personally, I think you are an idiot and should not be building hybrids. Now stop posting your off topic nonsense in my thread. This thread is about my launcher, not yours.
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Unread postAuthor: noname » Sat Jun 30, 2007 8:06 pm

SpudBlaster, DR did shoot the hybrid at 5x. He said it was out of pure stupidity and would never be attempted again.
I have experimented with DDT, and used a 1/2" Sch 80 steel x 5 foot combustion chamber at 6x with one spark in the very end. It didn't blow, but did cause the steel to actually bulge outwards in a "blister" near the union.
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Unread postAuthor: 666lucky693 » Sat Jun 30, 2007 8:18 pm

that is amazing one day i am going to build a hybrid my potato cannon goal is to break a sound barrier i have to have alot of time to figure out the workings to get it i am going to work on making a really good pneumatic and then a good combustion to get ready for making a hybrid
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Unread postAuthor: Fnord » Sat Jun 30, 2007 9:15 pm

I have experimented with DDT, and used a 1/2" Sch 80 steel x 5 foot combustion chamber at 6x with one spark in the very end. It didn't blow, but did cause the steel to actually bulge outwards in a "blister" near the union.


Was there a burstdisk in the union, or was the blast entirely contained?
I can't imagine 1/2" sch80 warping that much. I mean, how many thousand psi is it rated for?
I guess I won't push my hybrid past 4x. I don't really feel like getting parts of my hand re-attached.
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Unread postAuthor: noname » Sat Jun 30, 2007 10:24 pm

There were 2 layers of 1/32" sheet steel as a burst disc. The report was, as you can probably imagine, very loud.
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Unread postAuthor: CannonBall » Sun Jul 01, 2007 6:18 am

So no DDT? then it must be possible to get 7x mix in a small chamber? and no DDT..
The i must conclude that if ure chamber is strong enough for like 300 bar.. you can probably get higher mixxes then 5... but only in a small chamber cause DDt needs a long way to occur... Right?
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Unread postAuthor: SpudBlaster15 » Sun Jul 01, 2007 11:52 am

DDT may have occurred. 1/2" steel pipe has a much higher burst pressure than say, 2" steel pipe. The fact that the pipe actually bulged outward when it should have easily withstood the pressure spike indicates that DDT could have occurred.

Like I told you before, playing with 7x mixes in a handheld hybrid is blatant stupidity, and could easily qualify you for a Darwin award. Now go make a thread about your launcher, and stop hijacking mine.
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Unread postAuthor: blindbatjosh121 » Sun Jan 13, 2008 12:34 pm

could someone explain exactly how a hybrid works differently from pneumatic or combustion
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Unread postAuthor: daberno123 » Sun Jan 13, 2008 1:19 pm

A Hybrid cannon is a mix between the two. It uses a pressurized flammable gas (propane or MAPP) with enough pressurized air to allow it to ignite. It is many more times more powerful than either a pneumatic or combustion. Next time look it up in the wiki or use the search function
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Unread postAuthor: blindbatjosh121 » Sun Jan 13, 2008 5:12 pm

ok i will - thanks
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Unread postAuthor: daberno123 » Sun Jan 13, 2008 5:37 pm

Don't mention it

And by the way

WELCOME TO SPUDFILES
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Unread postAuthor: SpudBlaster15 » Sun Jan 13, 2008 5:46 pm

daberno123 wrote:It is many more times more powerful than either a pneumatic or combustion.


Not necessarily, a pneumatic launcher running on multiple kpsi pressures and using helium will outperform every hybrid launcher currently in existence.
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Unread postAuthor: Hubb » Sun Jan 13, 2008 5:53 pm

SpudBlaster15 wrote:
daberno123 wrote:It is many more times more powerful than either a pneumatic or combustion.


Not necessarily, a pneumatic launcher running on multiple kpsi pressures and using helium will outperform every hybrid launcher currently in existence.


Now if we can only see one of those....
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Unread postAuthor: Novacastrian » Fri Jan 18, 2008 4:00 am

SpudBlaster15 wrote:You do not want to go above 5x. If you do, you risk DDT, which can cause even the strongest of steel chambers to rupture.

7x mix hybrid + hand held = blatant stupidity.


Then i guess i am <a href="http://www.spudfiles.com/forums/the-brass-bruiser-t11795.html">"Blatently Stupid"</a>
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