[Public-list] weight distribution and electric power

[Mike Lehman]

I charge mine off the USB port on my laptop.



Mike Lehman
~~~_/)_/)~~_/)~~~




----Original Message Follows----
From: "J Bergquist" <jbergqui at gmail.com>
Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Subject: Re: [Public-list] weight distribution and electric power
Date: Fri, 29 Sep 2006 16:34:58 -0400

Roger,

How DO you recharge your cell phone?

Like you, I can't wait to hear how that electric propulsion system works!
Pretty jazzed myself...

but not as jazzed as I would be if I knew how to recharge my cell phone!

That is some serious jazz!

Enjoy your row.

J

On 9/29/06, Roger L Kingsland <r.kingsland at ksba.com> wrote:
 >
 > Wow, my head is spinning (more than usual).  With all this technical
 > stuff,
 > I am just happy to know we will soon have an electric powered A30.  Old
 > meets new (well, new to us) and we get to measure the results.  Thanks
 > Dan.
 > I am so jazzed, I feel like finally learning how to recharge my cell
 > phone.
 >
 > Have a great weekend everyone.  I'm off to row on the river.
 >
 >
 > Roger Kingsland
 > Managing Partner
 > KSBA Architects
 > 3441 Butler Street
 > Pittsburgh, PA 15201
 > N40°- 27.83'  W79°- 57.99'
 >
 > (412) 252-1500 x101 office
 > (412) 779-5101 cell
 > (412) 252-1510 fax
 > www.ksba.com
 > ----- Original Message -----
 > From: "isobar" <isobar at bcpl.net>
 > To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>;
 > "dan
 > walker" <dsailormon at yahoo.com>
 > Sent: Friday, September 29, 2006 3:57 PM
 > Subject: Re: [Public-list] weight distribution and electric power
 >
 >
 > > >===== Original Message From dan walker <dsailormon at yahoo.com> =====
 > >>  i was told i can motor 25 to 50 mile before empty. supposedly th 
batts
 > >> will
 > > recharge as i sail. the system has "smart" chargers that i am to plug 
in
 > > while
 > > at the dock. i wont know until next springs sea trials how well any of
 > > this
 > > works. the owner of the company is an electrical engineer and a 
horrible
 > > salesman. that helped a lot in my decision to give the asmo a try. will
 > > report
 > > in---good or bad when i REALLY know the answers from experience
 > >
 > > =====
 > >
 > > Dan. Maybe the owner is vague not because he's a bad salesman, but
 > because
 > > he's a good one.
 > >
 > > 25 to 50 miles isn't clear unless you know the boat speed. Remember 
that
 > > pre-nuclear submarines could travel  for over a day at 2 knots on
 > battery,
 > > but
 > > only about half an hour at 18 knots. Your range is strictly governed by
 > > motor
 > > current draw at various loads,  and your  engineer/salesman should be
 > able
 > > to
 > > give you a graph of that.
 > >
 > > Take some back of the envelope calculations: How much energy does it
 > take
 > > to
 > > push an Alberg thru the water at 5 knots? Guess 8 HP minimum - think of
 > a
 > > 9.9
 > > HP outboard bolted to the transom. - someplace in that ballpark. That's
 > 6
 > > kilowatts or 6000 watts. With a 48 volt system (same energy as for a 12
 > V
 > > system), that's a 125 amp current draw.
 > >
 > > If your regenerative braking prop gives back 1 amp @ 48 Volts while
 > > dragging
 > > thru the water at an average 4 knot sailing speed (Generous estimate),
 > > then
 > > the 125/1 ratio means you'd have to sail for 125 hours to recharge 1
 > hour
 > > of
 > > motoring.
 > >
 > > If you have a 25 mile range at 5 knots under power, that's 25 miles/ 5
 > mph
 > > = 5
 > > hours X  125 amps = 625 amp-hours worth of battery capacity you'd need
 > on
 > > the
 > > boat. How much does that weigh? I don't know about the capacity of 48V
 > > batteries, but that's the equivalent of  over 25 Deep-discharge 12V
 > > batteries.
 > >
 > > All the above is guesswork, and I could very well be wrong, but you
 > might
 > > ask
 > > the questions.
 > >
 > > Bob Kirk
 > > Isobar #181
 > >
 > > _______________________________________________
 > > These businesses support your Association:
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 > > Please support them.
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 > >
 > >
 > >
 >
 >
 > _______________________________________________
 > These businesses support your Association:
 > http://www.alberg30.org/store/A30supporters.html
 > Please support them.
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 >
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