[PSUBS-MAILIST] Brushless Motor Drive

[brian]

Hi Carsten,
                       Do you need to worry about expansion of the oil when the bow thruster motor heats up?  Do you have a remedy for that?  or maybe it's not a problem because you use it only when docking.
Brian
-----Original Message-----
From: <MerlinSub at t-online.de>
Sent 10/26/2013 3:03:00 AM
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Brushless Motor DriveE-Mail Software 6.0I did this in the past. Looks cool and second
hand lower units are relative unexpensive if you purchase ouboards with
damage
heads - but do not work well.  
Special
with a oil
hydraulic forward and aft shift system it is nearly impossible.

Needs
allways a iddle rpm of the engine to feed the oil pump and to shift.

Means
you have to run forward to shift in reverse and opposite. 
Or need a
clunch.

Also the modern units are more complicate in the shift and oil
system than
it looks like. http://www.euronaut.org/content/gfx/equipment/Bowthrustermockeup01.jpghttp://www.euronaut.org/content/gfx/equipment/IMG_5913a.jpg
We
scrapp both prototypes and purchase normal electric bowthruster and oil
compensate them. 
Was much easier. 
vbr Carsten 
"Alan James" <alanlindsayjames at yahoo.com> schrieb:
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.AlanFrom: Joe Perkel
<josephperkel at yahoo.com>To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org> Sent: Saturday, October 26, 2013
8:30 AMSubject: Re: [PSUBS-MAILIST]
Brushless Motor DriveAlan, 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'sMagic Oven, just
"Set it and forget it!" JoeFrom: Alan James <alanlindsayjames at yahoo.com>To: psubs.org <personal_submersibles at psubs.org> Sent: Friday, October 25, 2013 5:57 AMSubject:
[PSUBS-MAILIST] Brushless
Motor DriveHi PsubbersI'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 givesplenty of margin of error for the air compensation system before
any watercould make its way to the motor.The gearing already exists for the higher speed of the brushless
motor, & althoughthere 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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-- 
Carsten Standfuß
Dipl.Ing.Schiffbau @
Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen
0172
8464 420
WWW.Euronaut.org
Carsten at euronaut.org_______________________________________________
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