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Re: [PSUBS-MAILIST] Ring Thruster Data
Just from looking at the structure, my guess is confirmed by your
description, that it's a brushless motor design, with the permanent magnet
rotor attached to the blades. It looks like an awfully simple design to be
worth $1M! I've seen motors with this sort of shape marketed, but I
couldn't find any examples just now.
BTW, the reason all this U/W stuff is so expensive isn't so much the
difficulty, it's due to the market being so very limited. If you make 100K
units of something, you can amortize a $1M development cost over each unit
at $10 each... not a big hit. If you only make 100 units (much more
realistic!) then your cost is $10K per unit, before you've even made the
part!
Mark Roberts
Chief Engineer
Harbortronics LLC
Mark@Harbortronics.com
253-858-7769 (Ph)
253-858-9517 (Fax)
www.Harbortronics.com
----- Original Message -----
From: "Brent Hartwig" <brenthartwig@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Sunday, January 07, 2007 5:32 PM
Subject: Re: [PSUBS-MAILIST] Ring Thruster Data
I had originally hoped I could get one of the Schilling thrusters but when
they became unavailable I also was thinking of trying to design and build
my own. But I didn't really wanting to do that. My first thoughts were of
a sealed brush-less motor turning a gear that would then turn a round gear
that was in the outer housing around the blades. Since there would likely
be oil or water in an around the round gear it would have an effect in the
way of resistance, unless I could make a sealed air section around the
gears. Even so the over all design may very well be more efficient then a
traditional prop style.
I found a quote from my friend that helped design the Schilling ring
thrusters girlfriend. Scott moved way down to Texas and so I haven't seen
him in a while, so I'll have to email him an get some better data.
"What I understand of it is that there are magnetic plates circling the
outside perimeter with wire coil. The electromagnetic field generated
causes the blades on the inside diameter to spin.
Oh, it only cost them a couple million for the design. Granted, they
bought the concept from some Russian company.
Mudpuppy says:
I thought they had serious financial problems.
Rebecca - says:
No, they only had financial problems when the French-based company Alstom
decided to sell the US branch of their companies, Alstom Schilling
Robotics included. Mr. Schilling bought back his company
The prototype was designed in Russia during the late stages of Cold War.
Scott and 2 other engineers made it work.
"A unique urethane casting, believed to be one of the first ever to be
co-molded with stainless steel, helps reduce the
Weight and cost and increase the life of an undersea robot. The Quest ROV
from Alstom Schilling Robotics
(Davis, California) was originally designed to perform deep-water
construction, inspection and maintenance tasks for
Offshore oil operations. At the heart of the Quest's propulsion system is
a 7.5-kilowatt electric ring thruster, which replaces the hydraulically
powered thrusters typically used
On ROVs. Schilling engineers originally ordered cast urethane blades as
prototypes, planning to switch to aluminum or
Injection molded plastic." end of quote
I'm starting a CAD model now of some of my design ideas for a ring
thruster in Solidworks so if you like I can show you what what I'm
thinking. I would love to have your imput as well as even put your design
ideas into a 3D model if you like.
Brent Hartwig freezing in north Idaho
From: Joe Alvarez <joeoutland@yahoo.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Ring Thruster Data
Date: Sun, 7 Jan 2007 15:43:03 -0800 (PST)
This design is one I have been looking for so I have started working with
a metal fabricator to make one as a test for me. We are going to work on
using chain or gears to make the design. We don't to worry about weight
so its going to be made out of steel.
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