Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 7:51 pm, edited 1 time in total.
Well the reason of the two regulators are simply that i was able to get two for free. I also thought that if i had a pressure to high between the two ball valves i could just unscrew the second one and exhaust some of the propane without having to change the pressure on the first one... but the main reason was that i had two of these. And the igniter being directly mounted directly on the gun was because i didn't wanted to have it taped anywhere on the gun and i liked the idea of shoulder launch and i put so much polyurethane on it that it covers quite a large surface and it's rock solid. I also put some washers coated with rubber to prevent the two fan screws to get out but the idea of dilling where the pipe and the fitting overlaps would have been a safer solution, i agree.
The only thing I see wrong is the non pressure rated bell reducer. Considering you have that I would guess there's more non pressure rated pipe/fittings... Not much to worry about on a combustion, bu I wouldn't want to hold that by my head...
Life's too short to mark off the items on your wish list...
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 7:50 pm, edited 1 time in total.
In my testing ABS Cellular Core works fine and passed several tests that Sched 40 PVC fail.
My test cannon is going into the 8th year of use. Still going strong.
I'll post the 2010 pressure test photos later. 2009 pressure test is posted in this thread. http://www.spudfiles.com/forums/abs-cel ... 17968.html For a 1X combustion, I think ABS is tougher than PVC. It is less likely to crack and shatter.
The biggest problem is it is soft enough and flexible enough that Cleanout Caps tend to blow off of them. Don't stand directly behind one.
There are several examples on the internet with higher power applications (Acytelene or oxygen added) that has split ABS. It is true it tends to split lengthwise and not shatter into shards.
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 7:50 pm, edited 1 time in total.
On close examination of the photos of the cannon, it looks like something besides black ABS cement was used for assembly. Please tell me it was glued with the correct glue. Many glues do not bond well to ABS. ABS cement will solvent weld the stuff.
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 7:50 pm, edited 1 time in total.
Nice job! Not sure what kind of "grinding, cutting and tapping" you did on your propane bottle adapter...all you should have to do is unscrew the crooked torch pipe out of the valve adapter housing. It's locked in pretty good with an epoxy of some sort but it can be broken loose with some big pipe wrenches or a pipe wrench and a vise and some he-man effort.
Once the torch pipe has been unscrewed, you can screw a 1/4" compression (tube) brass fitting in there...usually a 1/4" tube to 1/4" NPT brass adapter will do the trick.
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Last edited by SpudBlaster15 on Wed Jul 14, 2021 7:58 pm, edited 1 time in total.
and i put so much polyurethane on it that it covers quite a large surface and it's rock solid. I also put some washers coated with rubber to prevent the two fan screws to get out but the idea of dilling where the pipe and the fitting overlaps would have been a safer solution, i agree.
Many glues do not bond well to ABS. ABS cement will solvent weld the stuff.
