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Re: [PSUBS-MAILIST] hydraulic efficiency questions

To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] hydraulic efficiency questions
From: MerlinSub@t-online.de
Date: 22 Sep 2006 07:25 GMT
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
Look for RC-Model electric aircraft supplier. 
burshless

An for example robbe/aveox AVX-1412/5Y No.4679
has 1200 watt at 20-34 volt with 40 A at 650 rpm.  
The unit is 60 mm long and has a diameter of 37,5 mm.... 
Weight is 650 gramms, Efficency is 85-90%

regards Carsten

"Rick and Marcia" <empiricus@telus.net> schrieb:
> 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
> > >
> > >
> > >
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