[PSUBS-MAILIST] Alan needs a motor

Thu Oct 30 20:28:00 EDT 2014

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 motor

without a gear box.

Why 3000rpm? Mainly because that seems to be the maximum that the professional

thruster manufacturers go to; also some other reading I have done indicated that

that 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

Alan

What 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 revs

too 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, which

is no good as far as drag is concerned, plus you need a big prop to get out beyond

the diameter of the motor. There are units with 5-1 gear box ratios at 48V 1500W

but they can weigh around 14kg. I bought an 1850W Hobby King BLDC outrunner

motor 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 your

prop 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 to

go 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 below

it's maximum voltage to keep the revs down. Also I wouldn't be thrashing the motor

which may help it live a lot longer.

Need to do a lot more study here, then experimentation with motors & props in water.

Alan

P.S. Hank I was given a motorized Golf trundler & converted it to a trike with ape hangers

and 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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