Re: [PSUBS-MAILIST] hydraulic efficiency questions

["Rick and Marcia" <empiricus@telus.net>]

Hi, Carsten - high performance motors - any links?

Rick L


----- Original Message -----
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Thursday, September 21, 2006 1:57 PM
Subject: RE: [PSUBS-MAILIST] hydraulic efficiency questions


> No hydraulics in Euronaut - I sold the hydraulid pump I get very cheap
short after starting the project. Any matrix I made for main drive,
thruster, anchor system etc. shows that hydraulics waste to much of the very
limit battery power source the sub has. Its now a full electric design.
There are now some very hig performance electric motors on the market.
>
> Hydraulic is fine for havy workmachines working on mud, ice etc. - and
were you have a big source of power..
>
> my fife cent. best regards Carsten
>
>
> "Jay K. Jeffries" <bottomgun@mindspring.com> schrieb:
> > John,
> >
> > It is funny that you should reference that web site.  Have a look at the
> > following URL within that site: http://www.allstar.fiu.edu/aero/jay.htm
> > Years ago, I was one of the original developers of the web site.at that
time
> > we built approximately 1200 web pages for aerospace education on the web
> > site.
> >
> >
> >
> > I agree with you that hydraulics have their applications.  If you work
> > through the physics for a 6 HP motor driving a hydraulic system, you
will
> > only get about 1.8 HP out of the prop after all the losses.  Jet drive
> > systems are even more inefficient.  I am sure your system will work but
is
> > it the most efficient for your money and ease of construction?
> >
> >
> >
> > The latest aircraft designs are moving to electrically driven systems
> > replacing all hydraulics.  Hydraulics had previously been used for their
> > dependability and the linear force that could be developed at a remote
> > location.
> >
> > R/Jay
> >
> >
> >
> > Respectfully,
> >
> > Jay K. Jeffries
> >
> > Andros Is., Bahamas
> >
> >
> >
> > It is the mark of an educated mind to be able to entertain a thought
without
> > accepting it.
> >   -  <http://www.quotationspage.com/quote/1152.html> Aristotle
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >   _____
> >
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of John
Gaertner
> > Sent: Monday, September 18, 2006 5:20 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] hydraulic efficiency questions
> >
> >
> >
> > For those of you who are intersted in hydraulicly driven systems, you
might
> > want to take a look at the following web site:
> > http://www.allstar.fiu.edu/aero/Hydr08.htm  You can learn a great deal
about
> > the basics of hydraulicly driven systems from this site. From my own
> > research, I would personnally say that they can be operated at much more
> > efficient levels than has been described recently. I, for one, am
designing
> > my entire propulsion system around a 6 HP, 24V hydraulicly driven pump
> > system. There are a great many valuable resources on the Net about
> > hydraulics and their safe, efficient operations. I would encourage folks
to
> > look further....
> >
> > Regards,
> >
> > John Gaertner
> >
> >
> >
> > ************************************************************************
> > ************************************************************************
> > ************************************************************************
The
> > personal submersibles mailing list complies with the US Federal CAN-SPAM
Act
> > of 2003. Your email address appears in our database because either you,
or
> > someone you know, requested you receive messages from our organization.
If
> > you want to be removed from this mailing list simply click on the link
below
> > or send a blank email message to:
removeme-personal_submersibles@psubs.org
> > Removal of your email address from this mailing list occurs by an
automated
> > process and should be complete within five minutes of our server
receiving
> > your request. PSUBS.ORG PO Box 311 Weare, NH 03281 603-529-1100
> > ************************************************************************
> > ************************************************************************
> > ************************************************************************
> >
>
>
>
>
>
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003.  Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
>
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of
> our server receiving your request.
>
> PSUBS.ORG
> PO Box 311
> Weare, NH  03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************
>




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************