<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div id="AppleMailSignature">I am not sure but I think that would be OK. </div><div id="AppleMailSignature">If you can measure the amps you are drawing & the speed your sub is</div><div id="AppleMailSignature">doing on the surface, you could make some conclusions from that, &</div><div id="AppleMailSignature">I think that is the only way to get some really good results. A bollard</div><div id="AppleMailSignature">test in a pool doesn't take in to consideration the forward movement of</div><div id="AppleMailSignature">the submarine, & there are also various effects from the sides of the test</div><div id="AppleMailSignature">pool & circulating currents. I will have to do this with my thrusters but it</div><div id="AppleMailSignature">is not perfect.</div><div id="AppleMailSignature">If you can test the amp draw & speed at both voltages then you can say</div><div id="AppleMailSignature">"Is the gain in speed worth the extra power draw on the battery!"</div><div id="AppleMailSignature">Are your propellers plastic? I don't think they are but as an aside, I have </div><div id="AppleMailSignature">wondered whether the tips bend when you put an extra load on them. </div><div id="AppleMailSignature">If say you are producing 100lb thrust, that thrust would be distributed across </div><div id="AppleMailSignature">the propeller & surely they wouldn't work efficiently with too much load on them!</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 14/11/2017, at 2:37 PM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Hi All,</div><div>Gamma has always run on a 24v 2 hp motor. The 24v 2 hp motor is simply a 36v motor run on 24v with reduced rpm. I am thinking about running the motor on 36v to increase surface speed. This is very simple because the controller will also run on both voltages.. My question is, will the propeller still be sized correctly. I am assuming the extra rpm is supported by the extra hp, or am I over simplifying it.</div><div>Hank</div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>