Hybrid idea

Justin · Thu Jan 26, 2006 6:19 pm

Hey, just a quick question.

I've been doing my research on cannons (specifically hybrids) and have wondered if it would be save to use an acetylene/oxygen mixture. But before you call be a stupid retard that is going to blow himself up, what if the cannon was only a meter long and 100% steel construction?

Just thought I'd do some looking into.

Justin

dragon finder · Thu Jan 26, 2006 6:26 pm

well first have you made a combustion or phnematic yet if not study them first.

beebs111 · Thu Jan 26, 2006 7:03 pm

this has been discussed on many threads, and i guess........... it would be............. VERY FREAKIN DANGEROUS!!!

oxyaceteline is used to cut through steel and is not safe for a normal steel gun dont do this but i suppose that if you had a very thick titanium or steel gun it might hold up, but it would not be worth chancin and would be way out of anyone heres price range

FiveseveN · Thu Jan 26, 2006 7:27 pm

Acetylene is very fast-burning. I's also lighter than "conventional" fuels, so it expands faster. Add pure O2 to that and you have an explosive device on your hands. Unless that steel pipe is more than 1/2'' thick, I wouldn't try it. You could make a steel hybrid that uses a high pressure mix (like 4x to 6x), or use propane and O2. Should be a little safer.

boilingleadbath · Thu Jan 26, 2006 7:45 pm

Hmm...
I calculate the energy of C2H2 (acetalene) being burnt at 1,235,000J/mole with a molecular mass of the reactents of 106amu. The density of C2H2 is 1g/L, and the density of air is 1.4g/L... thus the energy/L of a C2H2/O2 mix is 15,100J.

I calculate the energy of C3H8 (propane) being burnt at 2,356,000J/mole with a molecular mass of the reactents of 204amu. The density of C3H8 is 1.8g/L, and the density of air is 1.4g/L... thus the energy/L of a C3H8/O2 mix is 17,200J.

That is, propane will release more energy/L than acetalene... why do you want to use the annoying, dangerous, and shattering acetalene?
(note that this is not inconsistant with C2H2 burning hotter; the density of the C2H2/O2 mix is lower, and CO2 has a significantly lower specific heat than gaseous H2O)

Justin · Thu Jan 26, 2006 8:01 pm

hy do you want to use the annoying, dangerous, and shattering acetalene?

True. Maybe propane would be the best bet.

well first have you made a combustion or phnematic yet if not study them first.

I have made many combustion and pneumatic guns. Do you guys have any great links for studying the specifics of a hybrid? I have been to many sites and all they describe is how "sweet" they are. Bah that doesn't help me much.

Thanks alot,

Justin

saladtossser · Thu Jan 26, 2006 8:10 pm

http://video.google.com/videoplay?docid ... 487&q=bomb

that was oxyacetalene in action with everyday plastic pipes
so r u suicidal or not?

dragon finder · Thu Jan 26, 2006 9:22 pm

that is cool looking but yes suicidal if there isn't a 1 foot thick wall between you and it

dragon finder · Thu Jan 26, 2006 9:24 pm

Justin wrote:
hy do you want to use the annoying, dangerous, and shattering acetalene?
True. Maybe propane would be the best bet.

well first have you made a combustion or phnematic yet if not study them first.
I have made many combustion and pneumatic guns. Do you guys have any great links for studying the specifics of a hybrid? I have been to many sites and all they describe is how "sweet" they are. Bah that doesn't help me much.

Thanks alot,

Justin

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