[PSUBS-MAILIST] Alan needs a motor

Thu Oct 30 20:07:06 EDT 2014

Hi Hugh,I'm looking for something under 3000rpm straight from the motorwithout a gear box.Why 3000rpm? Mainly because that seems to be the maximum that the professionalthruster manufacturers go to; also some other reading I have done indicated thatthat was at the high end.Alan
      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Friday, October 31, 2014 1:00 PM
 Subject: Re: [PSUBS-MAILIST] Alan needs a motor

#yiv0532797367 #yiv0532797367 -- _filtered #yiv0532797367 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv0532797367 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered #yiv0532797367 {font-family:helveticaneue;}#yiv0532797367 #yiv0532797367 p.yiv0532797367MsoNormal, #yiv0532797367 li.yiv0532797367MsoNormal, #yiv0532797367 div.yiv0532797367MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0532797367 a:link, #yiv0532797367 span.yiv0532797367MsoHyperlink {color:blue;text-decoration:underline;}#yiv0532797367 a:visited, #yiv0532797367 span.yiv0532797367MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0532797367 p.yiv0532797367MsoAcetate, #yiv0532797367 li.yiv0532797367MsoAcetate, #yiv0532797367 div.yiv0532797367MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}#yiv0532797367 span.yiv0532797367EmailStyle17 {color:#1F497D;}#yiv0532797367 span.yiv0532797367BalloonTextChar {}#yiv0532797367 .yiv0532797367MsoChpDefault {font-size:10.0pt;} _filtered #yiv0532797367 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0532797367 div.yiv0532797367WordSection1 {}#yiv0532797367 AlanWhat revs?  Hugh    

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Friday, 31 October 2014 12:40 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Alan needs a motor  Hi Brian,thanks. That one is 15hp & 8" diameter.The motor I do have is 2hp & 2" diameter but just revstoo fast. Hopefully I will find a solution that doesn't need a gear box.Alan  From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Friday, October 31, 2014 12:25 PM
Subject: Re: [PSUBS-MAILIST] Alan needs a motor  What about this one? http://www.thunderstruck-ev.com/motenergy-me0909.html brian

--- personal_submersibles at psubs.org wrote:

From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Alan needs a motor
Date: Thu, 30 Oct 2014 20:22:42 +0000 (UTC)  Thanks Hank & Graham.I am probably searching for Nirvana here.First I am set on finding a brushless motor solution.I spent multiple hours of Googling, focusing on E-bikes, scooters etc.The E-bikes are mainly hub motors that are narrow with a large diameter, whichis no good as far as drag is concerned, plus you need a big prop to get out beyondthe diameter of the motor. There are units with 5-1 gear box ratios at 48V 1500Wbut they can weigh around 14kg. I bought an 1850W Hobby King BLDC outrunnermotor for $56- & it weighs 530 grams. So more powerful & 1/27th the weight.This does 236 rpm per volt, & from what I've read you don't want to be turning yourprop at more than 3000rpm on a sub. This means I would have to drive this motor with a maximum of 12V & it's rated for a maximum of 37.To disipate the heat from the stationary inner coil of an outrunner, I may be forced togo with oil compensation; which is what most commercial brushless thrusters are anyway.One solution I can see is to go with a much larger hobby type motor & run it way belowit's maximum voltage to keep the revs down. Also I wouldn't be thrashing the motorwhich may help it live a lot longer.Need to do a lot more study here, then experimentation with motors & props in water.AlanP.S. Hank I was given a motorized Golf trundler & converted it to a trike with ape hangersand pink banana seat for my girls. Boy did they love showing off on that.  From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org 
Sent: Friday, October 31, 2014 1:32 AM
Subject: [PSUBS-MAILIST] Alan needs a motor
Alan,
I just went on ebay and found a 1,000 watt 48v brushless motor with controller for 200 dollars.  It is for an electric bike.  I bought one for my son a few years back and it was amazing.  He was driving it all over town and towing his buddy on his skate board. Just type in  brushless 48 v motor.
You won't need a gearbox either.
Hank
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