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kleptophobiac · 10-18-2004, 01:13 AM

I was wondering if anybody has already done this...?

Right now I am setting up to make a hydrogen powered spud gun. My hydrogen/oxygen production unit is nearing completion, loosely based off of this site:
http://www.fortunecity.com/greenfiel...6/hydrogen.htm

Using my cosmic power of solving PV=nRT and the specific heat/heat of formation of water, I have determined that the heat generated would handily melt PVC, and that output pressure should be about 8.35 times the input pressure of H2 + O2 mix. It goes without question that there is a good chance this gun will blow up.

In order to simulate the various conditions of a gun of this type, I plan on writing a java program that takes all sorts of things into account.

These things should be important:
Volume of chamber and barrel
C/W of PVC pipe
Wall thickness
Ambient temperature
Ammunition displacement versus time (implicit differentiation to come up with related rates of pressure vs temperature vs ammo position)
Mass, size, shape of ammunition
Air drag information on ammunition
Spark location
Flame front speed, temperature, and location

The idea here is to calculate peak pressure and temperature that the gun will be exposed to, and to calculate if the pipe will hold or explode.

Any thoughts? I'll be posting back here as I make progress.

EDIT:
Video of an exploding balloon using fuel made from my completed electrolysis unit. here

10-18-2004, 01:13 AM	#1 (permalink)
kleptophobiac Upright	Hydrogen powered spud gun - now with a video I was wondering if anybody has already done this...? Right now I am setting up to make a hydrogen powered spud gun. My hydrogen/oxygen production unit is nearing completion, loosely based off of this site: http://www.fortunecity.com/greenfiel...6/hydrogen.htm Using my cosmic power of solving PV=nRT and the specific heat/heat of formation of water, I have determined that the heat generated would handily melt PVC, and that output pressure should be about 8.35 times the input pressure of H2 + O2 mix. It goes without question that there is a good chance this gun will blow up. In order to simulate the various conditions of a gun of this type, I plan on writing a java program that takes all sorts of things into account. These things should be important: Volume of chamber and barrel C/W of PVC pipe Wall thickness Ambient temperature Ammunition displacement versus time (implicit differentiation to come up with related rates of pressure vs temperature vs ammo position) Mass, size, shape of ammunition Air drag information on ammunition Spark location Flame front speed, temperature, and location The idea here is to calculate peak pressure and temperature that the gun will be exposed to, and to calculate if the pipe will hold or explode. Any thoughts? I'll be posting back here as I make progress. EDIT: Video of an exploding balloon using fuel made from my completed electrolysis unit. here Last edited by kleptophobiac; 10-24-2004 at 05:31 AM..