[PSUBS-MAILIST] Alan needs a motor

Thu Oct 30 22:22:34 EDT 2014

Why not buy a Minnkota or like and use the motor part ?

Pete
--------------------------------------------
On Thu, 10/30/14, Hugh Fulton 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>
 Date: Thursday, October 30, 2014, 7:28 PM

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 #yiv9915414630 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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