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| jackssmirkingrevenge |
 Posted: 12/23/2007 4:23 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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After much mulling over the idea, I decided the "floating" piston idea is worth a go and am currently making a prototype that should funtion in theory something like the attached animation:
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| POLAND_SPUD |
| Posted: 12/23/2007 5:53 AM Post subject: |
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Brigadier General
Joined: 13 Oct 2007
Posts: 876
2174.38 Spud Bux
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| wouldn't you get similar results with a QEV and a safety valve ? I think that there is some off the shelf part that is used to get pulsed air...
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| jackssmirkingrevenge |
| Posted: 12/23/2007 7:01 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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| POLAND_SPUD wrote: | | wouldn't you get similar results with a QEV and a safety valve ? I think that there is some off the shelf part that is used to get pulsed air... |
Technically, yes - but I can make it myself out of a syringe, a length of PVC pipe and copious amounts of expoxy, for a mere fraction of the cost, in a much more compact frame. Also, unlike using a QEV and safety valve, no air whatsoever is wasted as it all goes towards pushing out the projectile.
Practically speaking, this is a piston valve, but without a pilot chamber and a significant delay between piston motion and valve opening. The fact that the piston moves before opening the valve means it has time to gather momentum, to "shock" the valve open, as well as allowing sufficient time before closing the valve for an efficient shot.
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| jackssmirkingrevenge |
| Posted: 12/24/2007 13:12 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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The prototype's well underway, should be ready for testing soon. Here's the valve with the floating element spring loaded (though this will likely be removed to allow for greater valve opening time) and a syringe seal making sure it's airtight - I hope to give you results, whether positive or (yes, MrCrowley :p) negative, within the next 24 hours 
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| ALIHISGREAT |
| Posted: 12/24/2007 13:33 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1115
652.81 Spud Bux
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 i can't see any epoxy  but i will assume there is some since you made it  i wish i had access to lots of syringes (not because i'm a druggy) because i could measure butane with them
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| jackssmirkingrevenge |
| Posted: 12/24/2007 13:43 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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| ALIHISGREAT |
| Posted: 12/24/2007 13:52 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
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*searches for druggy smiley* *finds some slightly 'wierd' smileys*      i did have second thoughts after posting about the piston but it looked kind of metallic... but i suppose it could be metal epoxy
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| jackssmirkingrevenge |
| Posted: 12/24/2007 13:55 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
9935.58 Spud Bux
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| ALIHISGREAT wrote: | | t looked kind of metallic... but i suppose it could be metal epoxy |
That's 'cause the aluminium tube shows under the transparent cast.
Anyways, I ought to be getting ready for some serious happy-birthday-to-you-JC boozing, see you all...eventually 
I'll switch off my PC to avoid any further PUI incidents in the near future 
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| ALIHISGREAT |
| Posted: 12/24/2007 13:59 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1115
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lol is it your birthday today or tomorrow, or maybe you are jesus  thats why you won't tell anyone where you live   (damn no jesus smiley  )
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| jackssmirkingrevenge |
| Posted: 12/24/2007 14:00 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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| ALIHISGREAT |
| Posted: 12/24/2007 14:04 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1115
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 my stoopid computor won't play the youtube vid... and the drunen singing must be fun won't you have a terrible hang over tomorow which would spoil christmas!
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| jackssmirkingrevenge |
| Posted: 12/24/2007 14:08 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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| ALIHISGREAT wrote: | | won't you have a terrible hang over tomorow which would spoil christmas! |
When you reach a certain age, Xmas is more about getting absolutely arse'oled on the eve than actually waking up early the next day to see what Santa has left you under the tree. Besides, a couple of paracetamol and a litre of water before going to bed and I usually wake up clear headed
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| ALIHISGREAT |
| Posted: 12/24/2007 14:13 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1115
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| Quote: | When you reach a certain age, Xmas is more about getting absolutely arse'oled on the eve than actually waking up early the next day to see what Santa has left you under the tree. Besides, a couple of paracetamol and a litre of water before going to bed and I usually wake up clear headed
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an you are calling me a druggy (well i am... i became addicted to lemsip when i had a really bad cold ) and surely a litre of water and a ton of booze = moist sheets in the morning
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| jackssmirkingrevenge |
| Posted: 12/25/2007 18:26 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6518
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Seasonal drinking aside, the prototype's finally ready for testing sadly it's too late now to fire up my compressor, so it'll have to wait till morning. until then, here's what it looks like, pretty much as per the animation. I decided to make it removable to allow for tweaking and maintenance.
Testing in a few hours, which will be met with whoops of unbridled joy, or a profusion of blasphemy most unbefitting to the seasonal theme
I'm pretty convinced about this design, if this particular prototype doesn't work, I have some modifications in mind that should get it to function.
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| floating piston unit assembled in cylinder and chamber. |
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| Carlman |
| Posted: 12/26/2007 1:16 AM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1111
293.38 Spud Bux
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| o isn't it so sexy, great work i so want your abilities...
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