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600 fps -new results

A place to ask general spud cannon related questions.
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Unread postAuthor: sjog » Tue Apr 24, 2007 8:00 pm

The barrel comes off at the camlock. The part of the barrel is screwed to the front of the action.The barrel is 74".From the chamber to the muzzle is 94".
The barrel support slides on the barrel and slides on a piece of 1 1/2 stock jamed into the vent .The black iron threaded pipe is 6". It comes off quite easily.
And yes it took lots of time and a bit of money. 150-200 hrs<img src="http://i116.photobucket.com/albums/o12/sjogun/th_IMG_0112.jpg" border="0">
This pic was a mock up of my idea, 3-4 months ago. I hated putting flat stuff on a round object. So I created a flat spot. I used Azek which is flat cellcore PVC.
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Unread postAuthor: ShowNoMercy » Tue Apr 24, 2007 8:03 pm

This is not about your gun directly, but I am interested in how long it takes for you to vent your chamber after each shot? And what do you use to do that? In retrospect I guess this is about your gun, my bad.
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Unread postAuthor: sjog » Tue Apr 24, 2007 8:17 pm

http://www.spudfiles.com/forums/viewtop ... html#79558
I vent 30-40- sec Ontill it dont smell burnt<img src="http://i116.photobucket.com/albums/o12/sjogun/th_IMG_0168.jpg" border="0"> Fan in 4" coupler, not clean out. Flush bushing in coupler w/1 1/2 " valve. Pos+neg thru bolts in front of sling ring in this pic
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Unread postAuthor: spudthug » Tue Apr 24, 2007 8:23 pm

for ur conversion needs 1 mph is 1.47 fps to be accurate about it...its that simple just use that instead of everyone elses
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: sjog » Tue Apr 24, 2007 8:46 pm

That makes it easy even for me, thanks spudthug!
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Unread postAuthor: SpudBlaster15 » Tue Apr 24, 2007 8:51 pm

hi wrote:uhh, yes, about for a ,smallish-mediumish sized one. my cousin has a chronograph and his propane cannon with a BBQ ignitor shoots at almost 700 fps.


I am betting that unless his barrel is extremely long (12ft+, with a chamber to match), the chronograph is placed much too close to the muzzle. Even a rather large sized combustion (8ft barrel or so) will not shoot at 700fps. A "smallish-mediumish gun" as you put it, will come nowhere close to what sjog is reaching.

Sjog, your chronograph readings sound correct. You must be using MAPP gas to achieve those numbers?
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Unread postAuthor: hi » Tue Apr 24, 2007 9:01 pm

spudblaster, the barrel was a 5 foot barrel with a 20'' chamber. the muzzle was about 2 feet from it. it shot at 650 something. i know because i saw it. i know what i was and i beleave it. if you go to burnt lakte there is some chrono testing and he got the same results. i think that tempature playes a roll in volocity.

and i guess i ment a medium combustion, im used to very large cannons, so that is small to me.

and he is using mapp gas, which is that yellow tank, thats the only tank that mapp comes in.
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Unread postAuthor: SpudBlaster15 » Tue Apr 24, 2007 9:04 pm

What was the barrel diameter? If it was 1.5" or larger, I am going to call BS on this one.

Burnt Latke achieved lesser velocity readings using a barrel that is nearly twice as long as the one your cousin used.
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Unread postAuthor: ShowNoMercy » Tue Apr 24, 2007 9:06 pm

Why are we argueing this in this thread? He posted his gun to show it off and now we are in some random arguement that isnt even about his gun.
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Unread postAuthor: sjog » Tue Apr 24, 2007 9:15 pm

SpudBlaster Yes ,Mapp gas. It is in the compition.
So that seems to you a maximum speed?
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Unread postAuthor: ShowNoMercy » Tue Apr 24, 2007 9:17 pm

Why does it matter if it runs on Mapp gas ? What else type of gasses are there?
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Unread postAuthor: sjog » Tue Apr 24, 2007 9:23 pm

Mapp Burns a little hotter than propane, so it is a little faster.These two are the most popular for bottled gas.
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Unread postAuthor: ShowNoMercy » Tue Apr 24, 2007 9:24 pm

What about Oxygen mixed with propane?
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Unread postAuthor: hi » Tue Apr 24, 2007 9:27 pm

look spudblaster, i know what i saw and im not lying, if you dont believe me that fine, but i know what i saw. And why are you making such a big deal, it is only about 70 fps faster, which isnt too much. all im saying is that he has the mix close, but not perfect. end of discussion

edit- oxygen makes pvc into a little hand-held bomb, dont even try it unless you have a really thick steel chamber.
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Last edited by hi on Tue Apr 24, 2007 9:35 pm, edited 2 times in total.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: ShowNoMercy » Tue Apr 24, 2007 9:28 pm

Were you on some type of mind altering drug? That would make those numbers are wavy and blurry....
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