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The M480 - Crowley goes Hybrid [Update 24/01/10]

Built a hybrid cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: POLAND_SPUD » Sun Mar 08, 2009 2:35 pm

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

:wink:
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Unread postAuthor: psycix » Sun Mar 08, 2009 4:50 pm

Its very nice! I love it. :D
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. :roll:
I wish I could buy a bucket of time. Sadly, that is not how our universe works.



But where is that vid you promised? :D
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Unread postAuthor: MrCrowley » Sun Mar 08, 2009 5:31 pm

I thought that afros were popular in 1980s...

Don't have an afro haha, my hair just sticks out at the sides.

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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Unread postAuthor: Ragnarok » Sun Mar 08, 2009 6:19 pm

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. :tongue3:
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jonnyboy » Sun Mar 08, 2009 7:00 pm

Ragnarok wrote: It's designed as a hybrid - and who said it used burst discs? :twisted:

Well common sense. :P 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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Unread postAuthor: elitesniper » Sun Mar 08, 2009 10:59 pm

Nice MrC! :D Very clean and smooth looking.
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Unread postAuthor: Carlman » Sun Mar 08, 2009 11:47 pm

jonnyboy wrote:
Ragnarok wrote: It's designed as a hybrid - and who said it used burst discs? :twisted:

Well common sense. :P 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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Unread postAuthor: MrCrowley » Mon Mar 09, 2009 12:09 am

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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Unread postAuthor: jackssmirkingrevenge » Mon Mar 09, 2009 12:34 am

Looking good (the hybrid I mean, you're looking vaguely like the Incubus vocalist :? :D ) - 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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Unread postAuthor: MrCrowley » Mon Mar 09, 2009 1:08 am

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 :wink:

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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Unread postAuthor: CasinoVanart » Sat Mar 14, 2009 5:49 am

Helllllo MrC, Have you aquired the barrel yet or are you being held to ransom by your parents?
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Unread postAuthor: THUNDERLORD » Sat Mar 14, 2009 10:38 am

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. : 8)
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Unread postAuthor: MrCrowley » Sat Mar 14, 2009 5:15 pm

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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Unread postAuthor: jonnyboy » Sat Mar 14, 2009 5:36 pm

Whats wrong with a 6 meter barrel? :P
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Unread postAuthor: MrCrowley » Sat Mar 14, 2009 5:50 pm

It costs about $300NZD ($150USD) :P
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