[PSUBS-MAILIST] Alan needs a motor

Thu Oct 30 22:44:59 EDT 2014

Hi Hugh,they rate them in kv, (revs per volt) & the one I have is 236.Turnigy Aerodrive SK3 - 5065-236kv Brushless Outrunner Motor
It says maximum voltage of 37 but at the kv rate it would get to 3000 rpm at 12V.(I think.) However I'm not sure what happens with a load on yet.I need to spend a lot more time studying / experimenting, with this.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 1:28 PM
 Subject: Re: [PSUBS-MAILIST] Alan needs a motor

#yiv0441540803 #yiv0441540803 -- _filtered #yiv0441540803 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv0441540803 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered #yiv0441540803 {font-family:helveticaneue;}#yiv0441540803 #yiv0441540803 p.yiv0441540803MsoNormal, #yiv0441540803 li.yiv0441540803MsoNormal, #yiv0441540803 div.yiv0441540803MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0441540803 a:link, #yiv0441540803 span.yiv0441540803MsoHyperlink {color:blue;text-decoration:underline;}#yiv0441540803 a:visited, #yiv0441540803 span.yiv0441540803MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0441540803 p.yiv0441540803MsoAcetate, #yiv0441540803 li.yiv0441540803MsoAcetate, #yiv0441540803 div.yiv0441540803MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}#yiv0441540803 p.yiv0441540803msoacetate, #yiv0441540803 li.yiv0441540803msoacetate, #yiv0441540803 div.yiv0441540803msoacetate {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv0441540803 p.yiv0441540803msonormal, #yiv0441540803 li.yiv0441540803msonormal, #yiv0441540803 div.yiv0441540803msonormal {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv0441540803 p.yiv0441540803msochpdefault, #yiv0441540803 li.yiv0441540803msochpdefault, #yiv0441540803 div.yiv0441540803msochpdefault {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv0441540803 span.yiv0441540803msohyperlink {}#yiv0441540803 span.yiv0441540803msohyperlinkfollowed {}#yiv0441540803 span.yiv0441540803emailstyle17 {}#yiv0441540803 p.yiv0441540803msonormal1, #yiv0441540803 li.yiv0441540803msonormal1, #yiv0441540803 div.yiv0441540803msonormal1 {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0441540803 span.yiv0441540803msohyperlink1 {color:blue;text-decoration:underline;}#yiv0441540803 span.yiv0441540803msohyperlinkfollowed1 {color:purple;text-decoration:underline;}#yiv0441540803 p.yiv0441540803msoacetate1, #yiv0441540803 li.yiv0441540803msoacetate1, #yiv0441540803 div.yiv0441540803msoacetate1 {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}#yiv0441540803 span.yiv0441540803emailstyle171 {color:#1F497D;}#yiv0441540803 p.yiv0441540803msochpdefault1, #yiv0441540803 li.yiv0441540803msochpdefault1, #yiv0441540803 div.yiv0441540803msochpdefault1 {margin-right:0cm;margin-left:0cm;font-size:10.0pt;}#yiv0441540803 span.yiv0441540803EmailStyle29 {color:#1F497D;}#yiv0441540803 span.yiv0441540803BalloonTextChar {}#yiv0441540803 .yiv0441540803MsoChpDefault {font-size:10.0pt;} _filtered #yiv0441540803 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0441540803 div.yiv0441540803WordSection1 {}#yiv0441540803 No what revs is the small motor you found.  You said it was very high.  Hugh  

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Friday, 31 October 2014 1:07 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Alan needs a motor  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  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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