PSN-L Email List Message
Subject: Re: Modified sound card and datalogging and geophones
From: "James Hannon" jmhannon@.........
Date: Fri, 22 Jul 105 12:56:29 CDT
Just about any mixture of acetylene and air or oxygen will detonate. Under the right conditions pure acetylene will detonate. Last year I filled a small (6 inch dia filled) ballon with acetylene and oxygen with the correct mixture and set it off. You really do not want to be anywhere near when it goes off! My ears were ringing for hours and I could feel the pressure wave push my pant legs back. Problem is that I am not sure how you would couple this explosion into the ground. Put on the surface the force would just reflect off the ground. So it would have to be buried. There is also a safety issue -- any tiny static charge on the ballon would set off the explosion and easily hurt someone.
---------- Original Message ----------------------------------
Date: Fri, 22 Jul 2005 13:46:30 EDT
>In a message dated 22/07/2005, royb1@........... writes:
>The carbide idea has some charm (I have a carbide cannon) but careful
>control of the acetylene-air ratio would be necessary to achieve a
>detonation. Electrolysis of water automatically insures stoichiometry.
> Agreed, but have you worked out how long it would take to get sufficient
>H2 and O2 by electrolysis and the number of amp hours required?
> You would need inert electrodes in the water + lime soda?
> You know the volume of the bottle and hence the volume of oxygen. You
>now need to weigh out the right amount of CaC2, tip it in the bottle and wait
>till it stops fizzling. It would probably be good enough?
>> Alternatively, equip your self with some balloons, fill them with
>> acetylene + oxygen and apply a glowing fuse or cigarette? I
>> suggest setting the gas torch burning with the correct flame shape, wipe
>> out the flame and then fill the balloon?
>Again, stoichiometry would require careful control of gas-air ratio.
>Also, balloons are harder to bury than bottles.
>The way my mind works, I was thinking of using sausage shaped balloons blown
>up inside a thin cardboard tube. If you light the acetylene flame and adjust
>the O2 to get a cylindrical blue centre, you have the correct gas ratio. You
>then push the flame onto a cold flat surface to snuff it out and use the
>nozzle to fill the balloon?
> This should work OK. It gets around having to have a license to handle
> Chris Chapman
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