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titty twister · 07-11-2004, 08:49 PM

I still have the combustion model I built a while back. First off...BoomTruck....good idea. Scatterblanket could save your ass.

On to the spudmaster....

2" PVC for barrel ~ 3 feet long.

4" PVC for chamber ~ 1 foot long.

4" to 2" reducer in the middle.

On the end of the 4" chamber, a threaded end w/ a sewer line clean-out cap.

For fuel, I drilled a 1/8" hole slightly into the chamber, followed by a 1/16" hold all the way through. During combustion, this hole is so small it hardly matters. This hole is where you stick the business end of the Ronsonol can (butane...the cig. lighter refill stuff you can get at any gas station) Only use a brief puff into the chamber as too much will push out all the oxygen causing it not to fire at all.

For the ignition, I must give myself credit for this one...my idea I have not seen duplicated....I robbed the entire workings of a gas grill starter and rigged the push button on the outside of the chamber, ran the 2 wires running from the button through another 1/16" hole (epoxied shut after feeding the wires) to the sparking mechanism which kinda dangled around on the inside of the chamber. You get the picture....push button...BOOM.

The only problem I found with this design is moisture from combustion of butane. H2O is a byproduct for you non-chemistry types. The vapor had a tendency to coat everything in the chamber sometimes causing a short in the sparker. Solution, open up the poop-chute cleaner-outer and let that baby dry out a bit.

Here's what not to do. (experience) My cousin and I got a bright idea to use an accelerant to further enhance the <i>punch.</i>

Method...fill the chamber with pure Oxygen before introducing butane and igniting. Where did we get pure oxygen? The oxy-acetylene torch in my dad's shop of course!

End result...the spudmaster 3000 came apart at the reducer sending the barrel skyward about 20 feet with a most impressive ball of fire roaring out of the chamber at my cousins face. Fortunately, he had enough presence of mind to have his face slightly turned when doing this....no harm done. But, it could have been another story easily.

But, it's back together now...we don't learn easy...

Good luck!

07-11-2004, 08:49 PM	#19 (permalink)
titty twister Upright Location: In the armpit.	I still have the combustion model I built a while back. First off...BoomTruck....good idea. Scatterblanket could save your ass. On to the spudmaster.... 2" PVC for barrel ~ 3 feet long. 4" PVC for chamber ~ 1 foot long. 4" to 2" reducer in the middle. On the end of the 4" chamber, a threaded end w/ a sewer line clean-out cap. For fuel, I drilled a 1/8" hole slightly into the chamber, followed by a 1/16" hold all the way through. During combustion, this hole is so small it hardly matters. This hole is where you stick the business end of the Ronsonol can (butane...the cig. lighter refill stuff you can get at any gas station) Only use a brief puff into the chamber as too much will push out all the oxygen causing it not to fire at all. For the ignition, I must give myself credit for this one...my idea I have not seen duplicated....I robbed the entire workings of a gas grill starter and rigged the push button on the outside of the chamber, ran the 2 wires running from the button through another 1/16" hole (epoxied shut after feeding the wires) to the sparking mechanism which kinda dangled around on the inside of the chamber. You get the picture....push button...BOOM. The only problem I found with this design is moisture from combustion of butane. H2O is a byproduct for you non-chemistry types. The vapor had a tendency to coat everything in the chamber sometimes causing a short in the sparker. Solution, open up the poop-chute cleaner-outer and let that baby dry out a bit. Here's what not to do. (experience) My cousin and I got a bright idea to use an accelerant to further enhance the <i>punch.</i> Method...fill the chamber with pure Oxygen before introducing butane and igniting. Where did we get pure oxygen? The oxy-acetylene torch in my dad's shop of course! End result...the spudmaster 3000 came apart at the reducer sending the barrel skyward about 20 feet with a most impressive ball of fire roaring out of the chamber at my cousins face. Fortunately, he had enough presence of mind to have his face slightly turned when doing this....no harm done. But, it could have been another story easily. But, it's back together now...we don't learn easy... Good luck! __________________ Ignorance solves all problems...If you can't see them, they can't see you.