[PSUBS-MAILIST] Brushless Motor Drive

[brian]

Hi Rick,
                  What kind of sailboat do you have and where are you?
Brian
-----Original Message-----
From: "Land N Sea" <landnsea1 at hawaiiantel.net>
Sent 10/26/2013 12:56:31 PM
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Brushless Motor DriveE-Mail Software 6.0Hi Brian I just had a bow thruster put in my sailboat, per, my wife’s insistence as
she was the one who had to do the leap of faith to the dock with bow and stern
lines in hand, and it draws a lot of power so I had to put in a dedicated
battery for it but the spec’s say that it will shut off automatically after
three minutes of continues use to prevent any damage from over heating. Might
want to check into that before going that direction? Rick From:brianSent: Saturday, October 26, 2013 3:54 AMTo:Personal Submersibles General
DiscussionSubject: Re: [PSUBS-MAILIST] Brushless Motor Drive 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 DriveI 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.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 AMSubject:
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'sMagic 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
AMSubject: [PSUBS-MAILIST] Brushless Motor
Drive Hi 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
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