REFLECTOR:RE:weak gas struts

[reflector@tvbf.org]

If you pull hard enough, even if the vapor pressure was zero, it would move.

Simple experiment.  Take a syringe, no needle.  Plug the end with your 
thumb.  Pull out the plunger.  It takes some force, probably 1-5 lb or so 
(depending on the diameter of the plunger) but it WILL pull.  Inside is a 
near vacuum.  Let go and it will snap in.  The vapor pressure of your thumb 
isn't significant.

The force you have to apply is the area of the face of the plunger times 
one atmosphere.  If the plunger is 1/2" in diameter, that force is 2.88 lbs.

If there is vapor pressure in the working fluid, the force is the area 
times the atmospheric pressure minus vapor pressure.




At 06:36 PM 1/1/04 -0500, Chuck Jensen wrote:
>Are you sure hydraulic will form a bubble under vacuum (likely to be
>encountered in this instance) given the vapor pressure of the hydraulic
>fluid compared to water?
>
>Chuck Jensen
>
>
>-----Original Message-----
>From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
>Behalf Of steve korney
>Sent: Sunday, December 28, 2003 1:21 AM
>To: reflector@tvbf.org
>Subject: RE: REFLECTOR:RE:weak gas struts
>
>
>It's like cavitations...That's how a boat propeller makes bubbles under
>water...
>
>
>Best... Steve
>
>
>----------------------------------------------------------------------------
>-------------------------------
>
>
>Steve,
>How does it produce this bubble? In my experience, you can lock a hydraulic
>cylinder from either side by blocking either the intake or exhaust port.
>
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