[Public-list] weight distribution and electric power

Fri Sep 29 14:06:41 PDT 2006

Someday maybe I will have teenagers to help me with the details of life like
charging my phone.

Until then, I am, unfortunately, one of those customers who is not able to
be reached.

I have dropped several into the water myself. Slippery little buggers.

And no matter how many chargers I buy, I always seem to get the wrong one
for my phone...

Have a smashing weekend. Go sailing.

J

On 9/29/06, Roger L Kingsland <r.kingsland at ksba.com> wrote:
>
> Roger,
> How DO you recharge your cell phone?
>
> J,
>
> Since I have dropped 4 into the water, most of the time I don't get a
> chance
> to learn.  Other times I have my teenagers do it.  The are so aggressively
> multitasking, I don't think they notice.
>
> Now I really leave to go rowing.  Must purge the mind with endorphins.
>
> Roger
>
>
>
> > 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
> >> >
> >> > _______________________________________________
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> >> >
> >> >
> >>
> >>
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>
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