SpudFiles

Hey fellow spuders,
figured I'd share my latest incarnation. 6' barrel and 30" chamber with the usual fuel and igniter goodies. Shoots far!

more specs and you used DWV

Welcome to Spudfiles.

Cannon looks good. You have more cannons that you can show us? Please post them.

and you used DWV

It's been said so no parroting guys!

does it have a breech loading system? there is a copuling on the barrel

SpudFarm wrote:more specs and you used DWV

I'd like to point out DWV has a good shock resistance meaning it can sustain pressure spikes of around a standard combustion. I have made several from DWV and Im yet to have a failure entirely due to the DWV.

However I digress. I love it mate keep up the good work.

Nice cannon dude.

@spudfarm I think its to change barrels. It seems like a hassle to have to unscrew it every shot, especially with the barrel supports.

Wierd two new guys posting advanced combustions in one day...
Verry nice gun, do you shoot anything other than taters?

That's one big A combustion you've got there. Absolute performance would have to be pretty decent by default.

"Ignitor goodies" does not adequately describe your setup there. Did you install a fan? Stun gun or BBQ ignitor, spark gap setup...?

Pretty clean job on the construction. You should should go into a little more detail on your write-up.

Thanks for your responses. Yes there are some DWV pieces on it in an attempt to have a more fluid curve for expanding gasses. The DWV parts seem as robust as the ones used for pressure, but some have less connection area for gluing.

The igniter is from a grill at the junkyard. It takes a AA battery and has 2 leads. Both leads will spark to ground, but directed towards each other jump over 1/2". There is a small momentary switch zip tied to the handle.

The metering system is made of 3/4" pipe and valves and one cut up bernzomatic torch. Originally I thought I would need a regulator, which is on the gun, but the Bernz regulates to any PSI up to 60. So I am using the reg thats on it for the gauge only. 3X the meter rod at 50PSI seems to be the strongest, at least feel and sight wise. Does anyone have recommendations for a chrony that works (space to fire through) speeding spuds?

The coupling at the base of the barrel is a result of changing the barrel length, originally it was 4' and after being introduced to the spud files, I realized I needed more internal barrel area because my chamber is so big. Its probably too big for the 6' barrel too. I know this has been a hot topic of discussion, but what is optimal chamber to barrel ratio? 1.5C to 1B?

I have not introduced a fan yet. i've been using compressed air for venting and shaking the gun for mixing. I am working on modifying a pull starter to make a manual chamber fan.

I'll post a photo of a coaxial I built later. It was more proof of concept than anything. I'm building a large coaxial this weekend as long as the parts arrive on Thursday. It will get the metering goods and ignition like the above and will feature 12' x 2" barrel and 31" x 6" chamber. What's the max distance for combustion spud guns that have been posted here?