<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div><span>Wow, I hadn't thought of that either. What a gem.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>You could use that for pneumatic cylinders also.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>Alan</span></div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial,
'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Dan H. <jumachine@comcast.net><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, April 13, 2014 10:23 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] new submarine inside to outside hydraulic<br> </font> </div> <div class="y_msg_container"><br>How to solve the problem of depth figuring in on the situation is to use <br>double ended cylinders. With a rod of the same size sticking out of each <br>end of each cylinder the effect of water pressure balances out. The force <br>is the same in either direction.<br><br>Dan H.<br><br>----- Original Message ----- <br>From: "hank pronk" <<a
ymailto="mailto:hanker_20032000@yahoo.ca" href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>><br>To: "Personal Submersibles General Discussion" <br><<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Sent: Saturday, April 12, 2014 8:58 AM<br>Subject: Re: [PSUBS-MAILIST] new submarine inside to outside hydraulic<br><br><br>Hi Carsten,<br>I am not sure about your math, I get a much different figure.<br>A 1/2 in rod has an area of .19in<br>multiply by 1,000 foot depth salt water 445psi = 87.33 lbs<br>With a 10 to 1 lever that would be 8.7 lbs to push with your arm.<br>Also you want a smaller cylinder inside with a longer stroke and you get an <br>even lighter load on your arm.<br>Hank<br><br> Subject: Re: [PSUBS-MAILIST] new submarine inside to outside hydraulic<br> To: "Personal Submersibles General Discussion" <br><<a
ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> Received: Saturday, April 12, 2014, 2:56 AM<br><br><br><br><br><br> E-Mail Software 6.0<br><br> Hi Scott,<br><br> 1 bar = 0,1<br> N/mm2<br><br> 1000 meter depth = 100 bar or 10 N/mm2<br> (or 1<br> kg/mm2)<br><br> A Hydraulic stamp of a 1/2 inch has a surface of 126<br><br> mm2<br> means the outside waterpressure on the cylinder stamp is<br> 1267<br> N or<br> 127 Kg or 0,13 ts.<br><br> If you make a drawing of your schematic you<br> will see<br> that it is not selfcompensating.<br> Means you need a inside force of<br> that<br> amout just to compensate.<br> If you asume you can take a pressure<br> of 0,013<br> ts<br> with some comfore by hand you inside zylinder piston has to<br> be<br> the 10<br> times more diameter thn the outside one.<br><br> By the way the same<br> force works<br> on your troughulls cables of the
same diameter.<br><br> vbr Carsten<br><br><br><br><br> <<a ymailto="mailto:swaters@waters-ks.com" href="mailto:swaters@waters-ks.com">swaters@waters-ks.com</a>> schrieb:<br><br> I have a question maybe someone can answer.<br> If you have two hydraulic cylinders that are completely<br> filled with<br> oil (no air pockets anywhere in the system) one in a<br> submarine and on<br> outside of a submarine. Each cylinder has the rod side<br> connected to the<br> head side of the other cylinder so when on rod extends, the<br> flow of one<br> makes the other cylinder do the same exact thing. Would the<br> one cylinder<br> that does the same as the other cylinder on the surface<br> function the<br> same way at depth? Or would the deeper you go the more force<br> you would<br> have trying to push the rod into the cylinder?<br><br> Thanks,<br> Scott Waters<br><br><br><br><br> -----Inline Attachment Follows-----<br><br>
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