[PSUBS-MAILIST] Alan needs a motor

[Alan James via Personal_Submersibles]

Hank,I did a search on that number & didn't come up with anything.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, October 31, 2014 1:23 PM
 Subject: Re: [PSUBS-MAILIST] Alan needs a motor
   

Alan, 
Yes brushless 48 v item  19123905315  
Hank--------------------------------------------
On Thu, 10/30/14, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Alan needs a motor
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Thursday, October 30, 2014, 8:02 PM
 
 Hank,was
 it brushless?Did an
 ebay search on brushless 48V but not anything
 suitable.Getting
 the low rpm is proving difficult.There are
 26,000 listings under Brushless motor on Ebay :(Alan
    
    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 
 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 
 
 Sent: Friday,
 October 31, 2014 12:09 PM
  Subject: Re:
 [PSUBS-MAILIST] Alan needs a motor
  
  
 
 Alan,
 I am not
 talking about a hub motor, the motor I am looking at is in
 the 3 to 4 in dia range.  
 Hank--------------------------------------------
 On Thu, 10/30/14, Alan James via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 
  Subject: Re:
 [PSUBS-MAILIST] Alan needs a motor
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Thursday, October 30, 2014, 4:22
 PM
  
  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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