<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1449865396752_6619" dir="ltr">Hank, </div><div id="yui_3_16_0_1_1449865396752_6619" dir="ltr">what ever happened to your idea of using a submersible pump as a thruster?</div><div id="yui_3_16_0_1_1449865396752_6619" dir="ltr">Have just been doing a bit of reading on oil compensation of submersible pumps.</div><div id="yui_3_16_0_1_1449865396752_6613">In this article....</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr"><a href="http://www.pumped101.com/oilvsair.pdf" id="yui_3_16_0_1_1449865396752_6621">http://www.pumped101.com/oilvsair.pdf</a><br></div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">it states that with oil compensation there is only a loss of about 1&1/2% efficiency </div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">over an air compensated motor.....</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr"> "What
does reduce an oil filled motor’s efficiency is the energy loss due to oil
circulation within the stator housing. </div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">As a rule of thumb, this circulation
requirement reduces efficiency by about 1.5% when compared to an air filled
motor. "<br></div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr"> Of interest was that they base this on the use of an oil "Shellflex 210" which has a viscosity of 20.3 cst at 40C.</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">I was recently trying to track down a silicone oil of 3cst thinking that I would need a really low viscosity to get reasonable efficiency.</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">A chemist I spoke to said at that low a viscosity it would be flammable.</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr">Alan</div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr"><br></div><div id="yui_3_16_0_1_1449865396752_6613" dir="ltr"><br></div></div></body></html>