[PSUBS-MAILIST] Brushless Motor Drive

[Alan James]

Hi Joe,
yes the bow thrusters are a better option.
I thought that because of the mass production of outboards, that a lower unit may be reasonably cheap & adaptable. After further Googling I found they were reasonably expensive & there could be issues with the gear case oil getting contaminated.
Alan


________________________________
 From: Joe Perkel <josephperkel at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Saturday, October 26, 2013 8:30 AM
Subject: Re: [PSUBS-MAILIST] Brushless Motor Drive
 


Alan,
 
Take a look a Lewmar thrusters, they have a 90 deg transfer case and housing that is purpose built, hydro-dynamically clean, and better adaptable that an OB lower unit, (that looks a bit cumbersome). I've not yet ruled out purchasing one in a boating flea market to get a closer look.
 
The advantage here would be two fold, matching already known specs exactly including the use of the props, tip clearance,.. etc, and secondly, removing as you say the motor housing from the flow path.
 
If I were to compensate, Id use the flex tubing method. But, I like pressure resistant housings for these "sport" depths. Like Popiel's Magic Oven, just "Set it and forget it!"
 
Joe

From: Alan James <alanlindsayjames at yahoo.com>
To: psubs.org <personal_submersibles at psubs.org> 
Sent: Friday, October 25, 2013 5:57 AM
Subject: [PSUBS-MAILIST] Brushless Motor Drive



Hi Psubbers
I've been thinking about motor compensation options.
Any thoughts about whether this idea may have any merits?.....
Mount a brushless motor vertically on an outboard motor lower unit gear case
& air compensate it.
The length of the vertical drive shaft from the motor to the gear case gives
plenty of margin of error for the air compensation system before any water
could make its way to the motor.
The gearing already exists for the higher speed of the brushless motor, & although
there is an energy loss through the gearing there would be some savings in 
that the motor is not directly in the path of the propellor thrust.
A can would need to be made around the motor & sealed on to the lower unit.
Regards Alan


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