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| squeaks |
 Posted: 10/23/2006 10:15 AM Post subject: Piston Speed |
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Captain
Joined: 01 Oct 2006
Posts: 329
466.29 Spud Bux
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Ok, here's a question I've had for a long time. What is faster, a chamber sealing piston or a barrel sealing piston?
Thanks for the help in advance
Squeaks |
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| Hotwired |
| Posted: 10/23/2006 13:28 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1679
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Piston flies back at the same speed in both cases, a barrel sealing one could be said to have less dead volume between the compressed air and the barrel and so fire a smidgeon faster.
If you're chucking a potato stick the difference of 1/20 of a second is nothing to burst a braincell about.
In fact your reactions are more likely to give a firing time delay than 150psi air expanding. |
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| POS |
| Posted: 10/23/2006 13:55 PM Post subject: |
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Major
Joined: 14 Sep 2006
Posts: 395
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| I think a chamber sealing valve is harder to mak though. Try a diafragma valve. That is even quicker, cause the diafragma isn't as heavy as a piston. |
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| boilingleadbath |
| Posted: 10/23/2006 15:53 PM Post subject: |
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Moderator
Joined: 12 Mar 2005
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1/20th of a second would be something to worry about, considering that's longer than the projectile spends in the barrel!
However, the time difference between a chamber-sealer and a barrel-sealer of similar porportions is closer to 1/500th of a second. (a barrel-sealer opens in about ~1/300th of a second)
(generaly, we measure these times in milli-seconds; a millisecond is 1/1000th of a second. Using this system, we would say that a chamber-sealer opens 2 ms slower than a barrel sealer, which means it opens in 5 ms [as opposed to 3].) |
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| Hotwired |
| Posted: 10/23/2006 18:47 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1679
3543.47 Spud Bux
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Ok, fine I haven't looked at GGDT very closely or very much.
I was trying to make a reference to the fact that the time difference between the two valves firing is very small and human reflexes are more likely to make a difference. |
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| jrrdw |
| Posted: 10/23/2006 19:02 PM Post subject: |
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Donating Moderator
Joined: 16 Nov 2005
Posts: 3139
4870.07 Spud Bux
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| I know mine is fast enough to keep me working on it! But it's worth it, i got a couple shots off today. |
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| squeaks |
| Posted: 10/24/2006 0:38 AM Post subject: |
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Captain
Joined: 01 Oct 2006
Posts: 329
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| Ok, if barrel sealing valves are a little faster and less complicated why does Joel make his a chamber sealing piston? |
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| POS |
| Posted: 10/24/2006 2:24 AM Post subject: |
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Major
Joined: 14 Sep 2006
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