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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: al-xg » Sun Aug 15, 2010 3:55 pm

I'll be quite short on time, but could give that a try, which one though ?
Plasterboard, pine, water jugs ?
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Unread postAuthor: SpudFarm » Sun Aug 15, 2010 4:08 pm

Plaster is what is most comonly used so give that a try.
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Unread postAuthor: Zeus » Mon Aug 23, 2010 4:22 am

ITWOST, I attempted a 15mm ball valve based launcher.

Epic fail.

I can't get epoxy to work no matter what.

I'm going to get a 15mm endcap tapped, so I can use the threaded schrader I've got.

Current count of working launchers, 0

Number of fails, 5

Sorry for the vent, cheapo epoxy annoys me.
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Unread postAuthor: Crna Legija » Mon Aug 23, 2010 6:30 am

whats happing with your epoxy, did you use the right ratio and mix it good also you have to rough up the part you are epoxying
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Unread postAuthor: Zeus » Fri Aug 27, 2010 12:31 am

I just think I had shite epoxy, so I'll just get some JB.

I know that stuff works, anything is better than $2 shop epoxy.
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Unread postAuthor: Crna Legija » Fri Aug 27, 2010 1:25 am

i used 2 dollar epoxy for my 700psi tank. and it only lost 130psi over night
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Attachments
Untitled.jpg
thats the shot of the gage at 700psi
dam i wish it was a psi/bar gage not kpa
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Unread postAuthor: Matt_NZ » Fri Aug 27, 2010 1:57 am

-_- wrote:i used 2 dollar epoxy for my 700psi tank. and it only lost 130psi over night


Thats, pretty good. You reminded me to do the same test. My gauge is in MPa, inconvenient. Yes.
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Unread postAuthor: SpudBlaster15 » Fri Aug 27, 2010 3:56 am

ITWOST, I finished the ignition system for a rather 'special' launcher.

Image

Image

And yes DYI, I do intend to lengthen the ignition leads. :lol:
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Unread postAuthor: inonickname » Fri Aug 27, 2010 4:07 am

Don't lengthen the ignition leads. Just make sure you're wearing your safety glasses :D

ITWOST, I have 1000 0.18g or something airsoft BB's coming from the UK, like $3-4 delivered..
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Unread postAuthor: POLAND_SPUD » Fri Aug 27, 2010 4:31 am

@-_-
damn I wish it was a psi/bar gauge not kpa

10bar = 1000 kPa
20bar = 2000 kPa and so on
just cross out two zeros and you've got bars
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Unread postAuthor: Crna Legija » Fri Aug 27, 2010 5:27 am

i know3 but bars sound better than kpa, like iv never seen kpa use in the real world.
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Unread postAuthor: inonickname » Fri Aug 27, 2010 6:03 am

-_- wrote:i know3 but bars sound better than kpa, like iv never seen kpa use in the real world.


It is used in the real world...Scientific pressure measurements tend to be in pascals..
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Unread postAuthor: Ragnarok » Fri Aug 27, 2010 8:36 am

-_- wrote:I know but bars sound better than kpa, like I've never seen kpa used in the real world.

Then you've been looking in the wrong places. Pascals, Kilopascals and Megapascals are the official scientific standard!
For comparison, bar aren't actually SI units. Although of course, they are defined in terms of SI units and can therefore be used alongside them very easily.

Either way, you're complaining about one of the simplest conversions possible...
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Unread postAuthor: Technician1002 » Fri Aug 27, 2010 12:22 pm

Most of the stuff I work with is in Kilopascals or Torr and Militorr.

Pascals are used for pressure and Torr is used for partial pressure (vacuum) measured as absolute pressure. When working with turbo molecular pumps and cryopumps, pressures well below 1 militorr is common. Most stuff we work with is not high pressure. Most stuff is regulated well below 10 Kpa for our work.

A very few of our gauges read in both Kpa and PSI. I wish more of them did.
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Unread postAuthor: Ragnarok » Mon Sep 20, 2010 2:56 pm

Somehow, I managed to borrow an HD camera for a short while today - so I figured I'd show you one of the tests I'm doing on what's being called HEAL 1.5 - the completed parts of HEAL 2, bolted to enough parts of HEAL 1 to get it working (so, still stuck with the old breech action, unfortunately)

Here we have a 25 bar test - barely over half the launcher's final power.
[youtube]http://www.youtube.com/watch?v=Br911-ZL3Oc[/youtube]

Unfortunately, although the visuals are decent enough, like any camera I've thus far seen, the sound in the video really doesn't do the real thing justice.
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