<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Yes I am a proponent of golf cart motors as well. If you can find a place that repairs them you can find some good deals. Best plan is to just make multiple back up motors and switch them out if you have any problem.</DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV> <BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Alan via Personal_Submersibles <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] Motor Suggestion?<BR>Date: Tue, 15 May 2018 22:15:05 +0000 (UTC)<BR><BR></DIV><DIV style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><DIV></DIV>
<DIV>James, for an inboard motor, you can't go wrong with golf cart motors. They are available in 48 volt and up to 8 hp I think. These motors are extremely durable and cost effective. Gamma has a 2 hp traction motor from a tenant sweeper, same as golf cart. At full load it barely gets warm. </DIV><DIV>Hank</DIV><DIV><BR></DIV>
<DIV>
<DIV style="color: rgb(38, 40, 42); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 13px;">
<DIV>
On Tuesday, May 15, 2018, 3:28:36 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><DIV><DIV><DIV>Hi James,</DIV><DIV>just had a look at the motor & it's a bit of a beast.</DIV><DIV>Looks like an in-runner. It says elsewhere it is cooled with a fan but has</DIV><DIV>the option in the check box for air or water cooling.</DIV><DIV> If you have a look at the Dragon submersible, they have gone with some</DIV><DIV>large diameter but short motors that resemble the high torque direct drive</DIV><DIV>bicycle hub motors that are popular. On the Dragon submersible it looks</DIV><DIV>like they have developed thier own propeller so that the thrust isn't hitting</DIV><DIV>the body of the thruster.</DIV><DIV>The cooling system on your motor isn't going to work if you put it in a water/</DIV><DIV>pressure proof enclosure. With the in-runner the coils are on the outside</DIV><DIV>& can dissipate their heat through the can, so there would be the option</DIV><DIV>of fitting the motor tightly in to a housing & letting the heat go through the</DIV><DIV>housing into the water; but the fins on the motor won't let that happen in</DIV><DIV>this case. Maybe grind them off. It has a temperature sensor so there is the</DIV><DIV>option of monitoring the temperature & running it at a suitable power. Some </DIV><DIV>escs can drop the power automatically if the temperature gets too high.</DIV><DIV>The motor is very expensive. There is this Maytech motor designed for electric</DIV><DIV>surfboards that is rated at 600W</DIV><DIV><A href="http://www.michobby.com/product/electric-surfboard-skateboard-e-bike-brushless-motor-8085-160kv-motor/">http://www.michobby.com/product/electric-surfboard-skateboard-e-bike-brushless-motor-8085-160kv-motor/</A></DIV><DIV>It is an 8085 160 kv out-runner & priced at $188- US. I am wanting to test </DIV><DIV>one of these but will test my smaller motors first to get a better idea of what </DIV><DIV>kv winding I should have. Maytech will wind to your specifications; I think you </DIV><DIV>have some knowledge of the RC world so you will understand this.</DIV><DIV>This motor being an out-runner has the coils on the inside & so I am relying</DIV><DIV>on oil for cooling. </DIV><DIV>You will need to replace the propeller shaft with a longer stainless shaft.</DIV><DIV>Your motor is designed to drive a pulley & you would have to check</DIV><DIV>what axial load the bearings take. In my thruster design I have my motors</DIV><DIV>suspended between two bearings in the thruster housing that take the</DIV><DIV>forward & reverse axial load.</DIV><DIV>Alien Power in England have some large brushless motors & motor controllers.</DIV><DIV>I think he's a small operator & he will respond to questions. Got an idea he's</DIV><DIV>in Birmingham.</DIV><DIV>I am focussed on my thruster testing at the moment, but could not put a </DIV><DIV>time on when I will test the 8085 motor. You can keep an eye on my progress</DIV><DIV>if you want to hold off your thruster build.</DIV><DIV>There is an electric surfboard site that are using large DC motors, that may be</DIV><DIV>of help, but these boards are doing 40kph, so are more like planning boats</DIV><DIV>rather than submarines that fall in to the work boat category.</DIV><DIV>Good luck.</DIV><DIV>Alan </DIV><DIV><BR></DIV><DIV><BR></DIV><DIV><BR><BR><DIV>Sent from my iPad</DIV></DIV><DIV><DIV><BR>On 16/05/2018, at 3:51 AM, James Frankland via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><SPAN>hi all</SPAN><BR><SPAN></SPAN><BR><SPAN>I am thinking about what motor I should use for my main thruster on</SPAN><BR><SPAN>Skadoc. Its got to be big.</SPAN><BR><SPAN></SPAN><BR><SPAN>All these ideas are just thoughts at the moment, as I am working on</SPAN><BR><SPAN>battery pods now.</SPAN><BR><SPAN></SPAN><BR><SPAN>Expecting delivery of pipe from UK today.</SPAN><BR><SPAN></SPAN><BR><SPAN>So I have time to think how motor configuration is going to work.</SPAN><BR><SPAN></SPAN><BR><SPAN>What do you guys think about this motor choice here? As a possibility.</SPAN><BR><SPAN></SPAN><BR><SPAN><A href="https://www.miromax.lt/en/m-6/c-39/c-45/product-500-bldc_motor_hpm-5000b_-_nominal_power_5-86kw">https://www.miromax.lt/en/m-6/c-39/c-45/product-500-bldc_motor_hpm-5000b_-_nominal_power_5-86kw</A></SPAN><BR><SPAN></SPAN><BR><SPAN>I have room for 12 x12v batteries, so all voltages are a possibility.</SPAN><BR><SPAN></SPAN><BR><SPAN>I am also thinking of running an inverter and working at 120v AC.</SPAN><BR><SPAN>investigating this.</SPAN><BR><SPAN></SPAN><BR><SPAN>Regards</SPAN><BR><SPAN>James</SPAN><BR><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></DIV></DIV></DIV><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV></DIV>
</DIV>
</DIV></DIV>_______________________________________________
Personal_Submersibles mailing list
<A href="/eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org">Personal_Submersibles@psubs.org</A>
<A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
</DIV>