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al-xg
PostPosted: 08/15/2010 14:55 PM    Post subject: Reply with quote

Colonel
Colonel

Joined: 19 Jan 2007
Posts: 504
106.35 Spud Bux

I'll be quite short on time, but could give that a try, which one though ?
Plasterboard, pine, water jugs ?
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SpudFarm
PostPosted: 08/15/2010 15:08 PM    Post subject: Reply with quote

Captain Slow
<b>Donating Member</b>

Joined: 04 Nov 2006
Posts: 2579
1492.77 Spud Bux

Plaster is what is most comonly used so give that a try.
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Zeus
PostPosted: 08/23/2010 3:22 AM    Post subject: Reply with quote

Colonel
Colonel

Joined: 27 Oct 2009
Posts: 749
1863.37 Spud Bux

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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Crna Legija
PostPosted: 08/23/2010 5:30 AM    Post subject: Reply with quote

shots shots shots
Major General

Joined: 20 Jul 2008
Posts: 1915
1664.80 Spud Bux

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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Zeus
PostPosted: 08/26/2010 23:31 PM    Post subject: Reply with quote

Colonel
Colonel

Joined: 27 Oct 2009
Posts: 749
1863.37 Spud Bux

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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Crna Legija
PostPosted: 08/27/2010 0:25 AM    Post subject: Reply with quote

shots shots shots
Major General

Joined: 20 Jul 2008
Posts: 1915
1664.80 Spud Bux

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


Untitled.jpg
 Description:
thats the shot of the gage at 700psi
dam i wish it was a psi/bar gage not kpa
 Filesize:  41.84 KB
 Viewed:  24 Time(s)

Untitled.jpg


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Matt_NZ
PostPosted: 08/27/2010 0:57 AM    Post subject: Reply with quote

Corporal
Corporal

Joined: 09 Apr 2010
Posts: 65
160.09 Spud Bux

-_- 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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SpudBlaster15
PostPosted: 08/27/2010 2:56 AM    Post subject: Reply with quote

Hybridian
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Joined: 18 Oct 2006
Posts: 2372
295.89 Spud Bux

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





And yes DYI, I do intend to lengthen the ignition leads. Laughing
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inonickname
PostPosted: 08/27/2010 3:07 AM    Post subject: Reply with quote

Major General
Major General

Joined: 07 Dec 2008
Posts: 2487
6556.71 Spud Bux

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

ITWOST, I have 1000 0.18g or something airsoft BB's coming from the UK, like $3-4 delivered..
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POLAND_SPUD
PostPosted: 08/27/2010 3:31 AM    Post subject: Reply with quote

Lieutenant General
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Joined: 13 Oct 2007
Posts: 4387
11901.36 Spud Bux

@-_-
Quote:
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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Crna Legija
PostPosted: 08/27/2010 4:27 AM    Post subject: Reply with quote

shots shots shots
Major General

Joined: 20 Jul 2008
Posts: 1915
1664.80 Spud Bux

i know3 but bars sound better than kpa, like iv never seen kpa use in the real world.
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inonickname
PostPosted: 08/27/2010 5:03 AM    Post subject: Reply with quote

Major General
Major General

Joined: 07 Dec 2008
Posts: 2487
6556.71 Spud Bux

-_- 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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Ragnarok
PostPosted: 08/27/2010 7:36 AM    Post subject: Reply with quote

Lord of Karma
Chief of Staff

Joined: 19 Dec 2006
Posts: 5158
16113.53 Spud Bux

-_- 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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Technician1002
PostPosted: 08/27/2010 11:22 AM    Post subject: Reply with quote

Senior Technician
Lieutenant General

Joined: 04 Apr 2009
Posts: 4670
15520.25 Spud Bux

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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Ragnarok
PostPosted: 09/20/2010 13:56 PM    Post subject: Reply with quote

Lord of Karma
Chief of Staff

Joined: 19 Dec 2006
Posts: 5158
16113.53 Spud Bux

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.

Link


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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