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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Unread postAuthor: Labtecpower » Thu May 17, 2012 11:48 am

looks cool, but what are those parts? :D
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Unread postAuthor: wyz2285 » Thu May 17, 2012 11:50 am

DYI are you building a super high pressure pump? :P
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: pneumaticcannons » Sun May 20, 2012 10:06 am

Made the first real progress on my cart hybrid on friday :) not much at all but it's a start. Along with some testing after installing a high volume, over barrel suppressor. I see why jack loves these things! My neighbors probably hate me a bit less now too lol.
[youtube]http://www.youtube.com/watch?v=TfOLx_AazVg[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Sun May 20, 2012 12:33 pm

Image

Full length suppressors *and* cartridges?

:D

Details on those wierd last tests hehe?

edit: peecture fix
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Last edited by jackssmirkingrevenge on Mon May 21, 2012 4:58 am, edited 1 time in total.
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Unread postAuthor: pneumaticcannons » Mon May 21, 2012 4:47 am

yep :D

the second to last was a failed chamber I started making for a mini combustion with a paintball inside. Messed up my room too. And the last was 2 paintballs inside a suppressor I made for my pen gun that also failed. Was trying to figure out what exactly happened since the ball bearing blew a hole in the side yet I found the sabot inside the metal pot thing. Im pretty sure the ball bearing exited the tube while the plastic straw sabot kept going....and some how penetrated metal
:?:
edit: just saw the pic... lol
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Unread postAuthor: Gun Freak » Mon May 21, 2012 8:17 pm

Nice RipStik, although I know you consciously left it there :D
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Unread postAuthor: MrCrowley » Mon May 28, 2012 10:42 pm

Removed the electrodes from my M480 mk.II hybrid today because they started to move around a bit (must've knocked them and broke the epoxy at some stage) and found my chamber full of this weird powdery stuff. I assume it's left over remnants from the previous shot with the cannon which failed to burst the disks.
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Unread postAuthor: jackssmirkingrevenge » Mon May 28, 2012 11:06 pm

Oh dear... surely it's time for a proper spark plug?
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Unread postAuthor: MrCrowley » Tue May 29, 2012 12:08 am

I've got a proper one curing for my piston hybrid and I've re-epoxied the electrodes on this one (don't have a suitable fitting to tap for one of my other spark plugs).
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Unread postAuthor: Crna Legija » Tue May 29, 2012 2:30 am

I found these 10x1mm thread you can find that tap at bunnings.
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Unread postAuthor: DYI » Thu May 31, 2012 7:44 pm

ITWOS: My capacitor bank went live today, firing its first test discharge at 10kJ through a gram of 5:11 aluminum/water mix. No insulation, charging, or switching problems detected.

The final plan for GPEG is complete, and it should be built by early July. It has been modified slightly since the last time I posted on the topic to include an expansion seal on the center electrode, thus hopefully solving the leakage problem for good.

Also, the 50MHz crystal oscillator for the break-wire timer has been obtained (after about 6 months of failed attempts). The timer should be operational by early August, and then we'll finally get to see how accurate my muzzle speed guesstimates for WARTL were.
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Unread postAuthor: jackssmirkingrevenge » Thu May 31, 2012 11:48 pm

DYI wrote:ITWOS: My capacitor bank went live today, firing its first test discharge at 10kJ through a gram of 5:11 aluminum/water mix.


How can you say things like these without the accompanying dramatic media?
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Unread postAuthor: MrCrowley » Fri Jun 01, 2012 12:47 am

Probably went overboard on the thickness (10mm) but they're quite clear and don't seem to have much effect on picture quality:
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edit: they're to shield my cameras while filming, if you were wondering.
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Unread postAuthor: Fnord » Mon Jun 04, 2012 5:40 pm

Crowley,

I've also noticed carbon buildup in hybrid chambers. Long ago when I did the sealed 2" sch40 test, I noticed some grime on the walls, having put perhaps 20 'shots' through it at various mixes. Ye olde piston hybrid accumulated it to a lesser degree, just not as much as you've shown.
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Unread postAuthor: Technician1002 » Mon Jun 04, 2012 7:30 pm

50 MHZ is not a common frequency. An easy to obtain frequency is 4, 8, or 16, which is easily divided to 1 Mhz reference for break wire clock. My time base for calibration checks is divided to 1 KHZ. Mechanical spacing error is orders of magnitude higher than the crystal 0.005%.
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