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<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>
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On Tuesday, May 15, 2018, 3:28:36 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv7999777524"><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 rel="nofollow" shape="rect" target="_blank" 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 clear="none"></div><div><br clear="none"></div><div><br clear="none"><br clear="none"><div>Sent from my iPad</div></div><div class="yiv7999777524yqt4352261222" id="yiv7999777524yqt25456"><div><br clear="none">On 16/05/2018, at 3:51 AM, James Frankland via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><span>hi all</span><br clear="none"><span></span><br clear="none"><span>I am thinking about what motor I should use for my main thruster on</span><br clear="none"><span>Skadoc. Its got to be big.</span><br clear="none"><span></span><br clear="none"><span>All these ideas are just thoughts at the moment, as I am working on</span><br clear="none"><span>battery pods now.</span><br clear="none"><span></span><br clear="none"><span>Expecting delivery of pipe from UK today.</span><br clear="none"><span></span><br clear="none"><span>So I have time to think how motor configuration is going to work.</span><br clear="none"><span></span><br clear="none"><span>What do you guys think about this motor choice here? As a possibility.</span><br clear="none"><span></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" 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 clear="none"><span></span><br clear="none"><span>I have room for 12 x12v batteries, so all voltages are a possibility.</span><br clear="none"><span></span><br clear="none"><span>I am also thinking of running an inverter and working at 120v AC.</span><br clear="none"><span>investigating this.</span><br clear="none"><span></span><br clear="none"><span>Regards</span><br clear="none"><span>James</span><br clear="none"><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div></div><div class="yqt4352261222" id="yqt84525">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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