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| POLAND_SPUD |
 Posted: 03/08/2009 13:35 PM Post subject: |
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Chief of Staff
Joined: 13 Oct 2007
Posts: 5051
13327.21 Spud Bux
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hmm It makes me think that it's a high time tu buil my own hybrid
I loled when I saw the last pic... I thought that afros were popular in 1980s...
sorry no offence intended - someone would point it out anyway
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| psycix |
| Posted: 03/08/2009 15:50 PM Post subject: |
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Donating Member
Joined: 25 Jun 2007
Posts: 3701
59332.61 Spud Bux
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Its very nice! I love it. 
Surely encourages me too. Pity it isnt legal over here (while pneumatic is).
Ofcourse that wont hold me back of building one.
But I've got some other projects to finish first. I havent machined some nice full-auto pneumatic yet, and thats an higher priority. Not even talking about studying and finishing that darn ball-mill. 
I wish I could buy a bucket of time. Sadly, that is not how our universe works.
But where is that vid you promised? |
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| MrCrowley |
| Posted: 03/08/2009 16:31 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 10058
12587.50 Spud Bux
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| Quote: | | I thought that afros were popular in 1980s... |
Don't have an afro haha, my hair just sticks out at the sides.
| Quote: | Pity it isnt legal over here (while pneumatic is).
Ofcourse that wont hold me back of building one. |
Same here, legal as sh|t but oh well don't plan on getting caught 
Vid is coming soon, i'm still at school. |
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| Ragnarok |
| Posted: 03/08/2009 17:19 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 5158
16113.53 Spud Bux
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| MrCrowley wrote: | | Same here, legal as sh*t but oh well don't plan on getting caught. |
That's good, because as far as I was aware, fewmet was legal in all the 195 countries in the world (it'd be a very inconvenient country where it was illegal) - however, having it in public is generally frowned upon.
Hmm, it's fun taking the literal meanings of swearwords.  |
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| jonnyboy |
| Posted: 03/08/2009 18:00 PM Post subject: |
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Colonel
Joined: 26 May 2008
Posts: 600
1000.92 Spud Bux
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| Ragnarok wrote: | It's designed as a hybrid - and who said it used burst discs?  |
Well common sense.  You have to have something to hold in the pre-ignition pressures. Actually I just had an idea...a modified check valve that is sealed when anything below xxx psi is applied. When the pressure is over that it opens aka ignition. Actually that sounds like a pop off valve. If you could machine one your self that had decent enough flow I don't see why it would work.
What's your idea? |
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| elitesniper |
| Posted: 03/08/2009 21:59 PM Post subject: |
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Brigadier General
Joined: 13 Oct 2007
Posts: 1089
1061.44 Spud Bux
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| Nice MrC! Very clean and smooth looking. |
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| Carlman |
| Posted: 03/08/2009 22:47 PM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1656
1386.12 Spud Bux
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| jonnyboy wrote: | | Ragnarok wrote: | | It's designed as a hybrid - and who said it used burst discs? |
Well common sense. You have to have something to hold in the pre-ignition pressures. |
search for piston hybrids mate, burst disks are not the only way to go but i aint saying thats what rags got p his sleeve. |
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| MrCrowley |
| Posted: 03/08/2009 23:09 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 10058
12587.50 Spud Bux
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Fired 6 shots at 6x today, got yelled at from my parents this time.
Made a few videos, without a barrel (as I have nothing to shoot at safely yet), just so I can have a look over them and see what the quality is like. Not sure if i'll be able to upload them by tonight though. |
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| jackssmirkingrevenge |
| Posted: 03/08/2009 23:34 PM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 21969
41087.27 Spud Bux
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Looking good (the hybrid I mean, you're looking vaguely like the Incubus vocalist  ) - but given the noise sensitivity issue, why not build a full length suppressor? Even just a couple of holes at the end of the barrel and a large diameter sleeve should make a significant difference, especially if packed with something to absorb the heat like wire mesh or steel wool. |
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| MrCrowley |
| Posted: 03/09/2009 0:08 AM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 10058
12587.50 Spud Bux
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| jackssmirkingrevenge wrote: | | but given the noise sensitivity issue, why not build a full length suppressor? Even just a couple of holes at the end of the barrel and a large diameter sleeve should make a significant difference, especially if packed with something to absorb the heat like wire mesh or steel wool. |
Because the sound is just so damn cool
I probably should, but I figure as soon as I get a barrel, the 4' of copper barrel should quieten the sound enough for my neighbours. |
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| CasinoVanart |
| Posted: 03/14/2009 4:49 AM Post subject: |
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1st Lieutenant
Joined: 30 Jul 2008
Posts: 290
550.23 Spud Bux
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| Helllllo MrC, Have you aquired the barrel yet or are you being held to ransom by your parents? |
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| THUNDERLORD |
| Posted: 03/14/2009 9:38 AM Post subject: |
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Loose Cannon
Joined: 28 Mar 2008
Posts: 1295
3814.51 Spud Bux
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I hadn't replied yet, because I didn't have much more to say than "Awesome MrC."...
But now I'm wondering , where's the vid???
(any chance of one)?
Also I was wondering how you got the fuel meter volume figured out???
Thanks MrC. :  |
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| MrCrowley |
| Posted: 03/14/2009 16:15 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 10058
12587.50 Spud Bux
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No barrel yet, finding it hard to get some 1/2" or 3/4" copper in 3' or 4' lengths. It's only sold commercially in 6m lengths.
No video yet because I took them with my handycam, which needs its software to rip the footage of it, and I don't have my computer currently, and can't install it on the computer i'm using for now.
I got the fuel meter volume figured thanks to Spudblaster15's Hybrid Fueling 101.
Chamber Volume/.954 (.958 for propane)
minus the chamber volume
times by 14.7 (to put it in PSI)
Divided by meter volume
29/.954 = 30.39
30.39-29 = 1.39
1/39 x 14.7 = 20.55
20.55/2.2 = 9.34PSI
1x = 9.34
2x = 18.68
etc
Then you fill the chamber to 14.7PSI for a 2x mix, 29PSI for a 3x mix etc.
Edit: Just realised you said volume, not pressure. Little bit hangover, I got my volume figured out by filling it with water. |
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| jonnyboy |
| Posted: 03/14/2009 16:36 PM Post subject: |
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Colonel
Joined: 26 May 2008
Posts: 600
1000.92 Spud Bux
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| Whats wrong with a 6 meter barrel? |
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| MrCrowley |
| Posted: 03/14/2009 16:50 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 10058
12587.50 Spud Bux
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| It costs about $300NZD ($150USD) |
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