Anybody know what "cracking resistance" might be for a regulator? I just picked up a ATX200 Black Pearl reg which has a "cracking resistance control" on the 2nd stage. It is very prominent as it sticks out the left side. It must do something useful. Anybody know what?
Michael
Cracking Resistance???
Started by
Sweeper
, May 04 2004 09:12 PM
10 replies to this topic
#1
Sweeper
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Posted 04 May 2004 - 09:12 PM
We can have what we want or our reasons why not!
#2
Walter
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Posted 05 May 2004 - 04:23 AM
Cracking resistance is how hard you have to breathe to start the air flow on your second stage. The lighter this is, the less effort to breathe, but also the easier it is to start a free flow.
No single raindrop believes it is responsible for the flood.
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#3
Sweeper
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Posted 05 May 2004 - 07:21 AM
I thought that was controlled by the Venturi lever. What's the difference?
Michael
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#4
Walter
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Posted 05 May 2004 - 07:29 AM
Nope. The Venturi lever adjusts how easily the flow is kept open once it is cracked. This makes it easy to maintain the free flow.
Cracking resistance - to open air flow.
Venturi - to keep air flow open.
HTH,
Walter
Cracking resistance - to open air flow.
Venturi - to keep air flow open.
HTH,
Walter
No single raindrop believes it is responsible for the flood.
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#5
maxdvr
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Posted 05 May 2004 - 07:46 AM
thanks walter....i guess i needed clairification on that one also......i knew how they worked...just didnt know the tech term for it.....great answer to my unasked question....Nope. The Venturi lever adjusts how easily the flow is kept open once it is cracked. This makes it easy to maintain the free flow.
Cracking resistance - to open air flow.
Venturi - to keep air flow open.
HTH,
Walter
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#6
Sweeper
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Posted 05 May 2004 - 08:18 AM
My thanks, too, Walter. Your explanation was simple and understandable. Much appreciated!Nope. The Venturi lever adjusts how easily the flow is kept open once it is cracked. This makes it easy to maintain the free flow.
Cracking resistance - to open air flow.
Venturi - to keep air flow open.
HTH,
Walter
Michael
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#7
Walter
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Posted 05 May 2004 - 08:20 AM
Any time, Michael. The venturi effect that keeps your regulator flow open is the same principle that allows airplanes to fly. It is on a much larger scale for aircraft.
No single raindrop believes it is responsible for the flood.
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#8
Sweeper
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Posted 05 May 2004 - 08:51 AM
Let's see if I understand that. As air flows through the aerodynamics provided by the pressure of our breathing provides the lift needed to keep the Venturi lever open and the air flowing.
How close am I?
Michael
How close am I?
Michael
We can have what we want or our reasons why not!
#9
Diverlady
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Posted 05 May 2004 - 09:06 AM
I have the same adjustment features on my Oceanic regs. My regs manual advises to store the regs with the crack resistance in the wide open position as it "relieves excess spring pressure on the poppet seat increasing it's service life."
Diverlady
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#10
jextract
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Posted 05 May 2004 - 10:33 AM
I thought this was the Bernouli effect?Any time, Michael. The venturi effect that keeps your regulator flow open is the same principle that allows airplanes to fly. It is on a much larger scale for aircraft.
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#11
Walter
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Posted 06 May 2004 - 05:11 AM
The Bernouli principle explains that other things being equal, faster moving air has less pressure than slower moving air. Yes, that explains why the airplane flies. Makes total sense unless you ask the obvious question. Why is the air on top of the wing moving faster? The first explanation I heard was so it gets to the back of the wing at the same time as the air on the bottom of the wing. Why would it care? It's not racing. Even if it did care and were racing, how would it speed up?
The answer is the Venturi effect. The Bernouli principle doesn't really explain much about flight, IMHO. It doesn't go to the root cause.
The answer is the Venturi effect. The Bernouli principle doesn't really explain much about flight, IMHO. It doesn't go to the root cause.
No single raindrop believes it is responsible for the flood.
DSSW,
WWW™
DSSW,
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