[PSUBS-MAILIST] Alan needs a motor

Fri Oct 31 13:22:36 EDT 2014

I think there is a formula for compromise,  the amount of compromise is the square root of how deep your pocket is in US funds multiplied by the limit on your credit card.
:-)
Hank--------------------------------------------
On Fri, 10/31/14, Brian Cox 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: Friday, October 31, 2014, 12:28 PM

 Alan,   That is the peak
 hp,  you wouldn't run it continuously at 15 hp, you may
 have to compromise ;)  we all have to
 ! 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 23:39:51 +0000
 (UTC)

 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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