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Spud Showdown

A place to ask general spud cannon related questions.
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Unread postAuthor: LikimysCrotchus5 » Tue Mar 25, 2008 8:21 pm

Oh sorry about that, i messed up.

Thx for correcting me. :banghead: Dumbass me (jk)
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4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
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Unread postAuthor: rcman50166 » Fri Mar 28, 2008 3:00 pm

So about that pykrete, is the stuff heavy because I don't want to risk an explosion from pressure build up. I typically use filled gatorade bottles and I feel safe shooting those. If a three in diameter slug weighs more than that, I'll be reluctant to use it. However with wood in the mix with frozen water I would assume it would be lighter if anything right?

Also I'm filming this weekend, the car is out, (fire department is doing a practice fire at a house and won't be able to supervise) but I still wanna try that steel plate if I can find one before Sunday. I will also try to get my hands on that 55 gal drum. I'm gonna try to get a couple of cinder blocks also. However, if all esle fails I'll just start stacking wood.

So place you final bets on who will win. It's my "General" vs. elitesniper's Big Blue.
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Unread postAuthor: Jared Haehnel » Fri Mar 28, 2008 3:17 pm

The stuff will be a bit heavier then regular ice but I doubt your gun will blow up if the object doesn't go through. I've see people try and blow up their old chambers by putting in meter propane and sealing both ends...nothing happened.

I don't know I have yet to see the competition...
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My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
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Unread postAuthor: DYI » Fri Mar 28, 2008 7:27 pm

If a combustion gun can't surive closed chamber combustion (~129 psig), then it is unsafe, and should be retired immediately, as it is a shrapnel wound just waiting to happen. If jammed rounds worry you, then it isn't well enough built.

I believe that Pykrete may be either slightly more dense, or slightly less dense than regular ice depending on the filler used. Either way, it shouldn't be as dense as water (1g/cm<sup>2</sup>), and will never approach the density of concrete (~2.4g/cm<sup>3</sup>), which it shares many physical properties with.

In a contest of shear power, the General will beat the Big Blue. But when one looks at the rather low quality and rare vids of FEAR in action, or the fact that mtronic beat me in the best shot comp, one will realise that a creative film maker can compensate for a weaker gun by using more creative ammo, targets, and movie making techniques.
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Unread postAuthor: rcman50166 » Mon Mar 31, 2008 12:43 pm

Bahh! Murphy's law is out to get me!

It's sunday afternoon. I have the cannon setup. I'm ready to shoot video and then it all goes wrong. A crack in the t-joint re-opens after lifting the gun on the wrong place. I go for the PVC cement and it's dry. Air leaked in and now it's completely useless. My local hardware store is closed on Sunday. I duct tape the crack in hope for a shot before the sun goes down. Then, the igniton coil quits on me. It only runs about halfpower, requiring me to reduce the "General" back down to two gaps. With that fixed, I go to fuel it. The spray bottle with gasoline in it gets clogged. Ahhh! I go down to the closest convenience (<-spelling?) store to get another bottle. I miss the closing by 15 min. I come back and try to fuel it by pouring gas down the wall of the chamber, only to flood it. It doesn't fire, I smell like gas, and now the sun is down, so I give up on trying to counter the most unfortunate, and numerous, series of events I've ever had.

Have pity for me. I'm about to take a sledge to the "General".
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Unread postAuthor: clide » Tue Apr 01, 2008 12:56 am

rcman50166 wrote: A crack in the t-joint re-opens after lifting the gun on the wrong place. I go for the PVC cement and it's dry... I duct tape the crack in hope for a shot before the sun goes down.

:shock: If your fitting has a crack in it then it is extremely unsafe and the only sane way to repair it is to replace the fitting completely. I'm surprised it hasn't blown apart completely if you have fired it with a cracked fitting.
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<a href="http://gbcannon.com" target="_blank"><img src="http://gbcannon.com/pics/misc/pixel.png" border="0"></a>latest update - debut of the cardapult

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Unread postAuthor: rcman50166 » Wed Apr 02, 2008 10:04 am

Yes, well the gun is safely behind a barrier and I'm beginning to care less and less about its well being. Anyway. One of the problems I had was the gun not firing. The only change at that point was adding the fans. Am I supposed to expect to use less fuel or more when using fans?
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Unread postAuthor: SpudFarm » Wed Apr 02, 2008 10:40 am

probably less without fans..
i don't really know about gasoline...
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