<html><body><div style="color:#000; background-color:#fff; font-family:tahoma, new york, times, serif;font-size:12pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">Vance,</SPAN></div>
<div style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN style="RIGHT: auto">Agreed, but there is a way to avoid this without compensation. You must use cheap hydraulic cylinders because they use an o-ring on the shaft instead of a wiper seal. A wiper seal needs pressure on one side to seal against water intrusion. With an o-ring seal that is not the case, an o-ring is a non directional seal. Essentially the hydraulic cylinder with an o-ring seal is exactly the same as a reach rod sealing system. <VAR id=yui-ie-cursor></VAR></SPAN></div>
<div style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN style="RIGHT: auto">Hank</SPAN></div>
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<DIV class=hr style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; HEIGHT: 0px; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px" readonly="true" contenteditable="false"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> "vbra676539@aol.com" <vbra676539@aol.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> personal_submersibles@psubs.org <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, September 19, 2013 9:10:55 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-MAILIST] hydraulics<BR></FONT></DIV>
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<DIV><FONT style="BACKGROUND-COLOR: transparent">Hank and all,</FONT></DIV>
<DIV>The issue is overall system pressure versus ambient pressure. If you have a hydraulic unit that builds pressure only when it is activated, and returns to zero when static, then any, and I mean ANY leak point will allow water to creep into your oil. A spring loaded compensator preset to your max ambient plus a little would mitigate that by maintaining system pressure at whatever you set it for.</DIV>
<DIV>Vance</DIV>
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<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica; COLOR: black">-----Original Message-----<BR>From: hank pronk <hanker_20032000@yahoo.ca><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Sent: Thu, Sep 19, 2013 3:22 am<BR>Subject: Re: [PSUBS-MAILIST] hydraulics<BR><BR>
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<DIV><SPAN>H Alan,</SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Bicycle brakes would probably work quite well because they are made from very good material. </SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Hank<VAR id=yiv5104759659yui-ie-cursor></VAR></SPAN></DIV>
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<DIV class=yiv5104759659hr style="FONT-SIZE: 0px; BORDER-TOP: rgb(204,204,204) 1px solid; HEIGHT: 0px; BORDER-RIGHT: rgb(204,204,204) 1px solid; BORDER-BOTTOM: rgb(204,204,204) 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: rgb(204,204,204) 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Alan <<A href="mailto:alanlindsayjames@yahoo.com" rel=nofollow target=_blank ymailto="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</A>><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org" rel=nofollow target=_blank ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, September 18, 2013 11:55:49 PM<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-MAILIST] hydraulics<BR></FONT></DIV>
<DIV class=yiv5104759659y_msg_container><BR>Hi Brian,<BR>I've wondered about this also.<BR>I was looking at the hydraulic brakes they have on bicycles now days &<BR>wondering if you could adapt them for functions like releasing emergency<BR>bouys or similar. The manual hydraulics they have on boats, like steering units<BR>are pretty expensive. Would be good to find something of suitable material<BR>off the shelf hat could be used.<BR>Alan<BR>.<BR>Sent from my iPad<BR><BR>On 16/09/2013, at 5:28 AM, "brian" <<A href="mailto:brian@ojaivalleybeefarm.com" rel=nofollow target=_blank ymailto="mailto:brian@ojaivalleybeefarm.com">brian@ojaivalleybeefarm.com</A>> wrote:<BR><BR>> I wonder if those human powered hydraulics could have an application for our boats, like the cats in the America's cup.<BR>> <BR>> Brian<BR>> _______________________________________________<BR>> Personal_Submersibles mailing list<BR>> <A
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