Re: [PSUBS-MAILIST] Ring Thruster Data

[Joe Alvarez <joeoutland@yahoo.com>]

Brent;

 

I would be more then happy to give you any input that I can on your ideas.  I used to draft in college a little so I can read blueprints and I am familiar with Auto CAD.  I don't have formal engineering training but I have lots of practical experience with machinery. 

 

I had a few ideas about this design.  The first was the simplest and easiest way to look at it was to take a large sprocket and cut the inside out.  From there I could weld down a thin flat layer of metal that would serve as the seal for an outer ring and the surface to hold the prop blades.  I would need to play with it to determine if packing the entire insides with grease or oil would be best or not.  I had toyed with the idea of making it very large and mounting the ring to the side or back of the craft and use the touch point as a sealed joint but that's just my mind wandering. 

 

The other idea was to use a standard brush-less electric motor design but one that allowed the center to be exposed for making the ring prop inside.  I am sure I am over simplifying that concept but its a place to start. 

 

Let me know what you think. 

 

Sincerely,

 

Joe A!

Brent Hartwig <brenthartwig@hotmail.com> wrote:

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
>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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