On Oct 11, 2010, at 9:19 AM, Steve Spence wrote:
> where did I see where a new boater complained the boat wouldn't plane.
> Dealer investigated, found trailer still attached .....
>
> Steve Spence
> Renewable energy and self sufficiency
>
http://www.green-trust.org>
http://arduinotronics.blogspot.com/>
> On 10/11/2010 12:15 PM, sv wrote:
> >
> >
> > so the solution to this is very simple. boats need wheels.
> >
> > On Oct 10, 2010, at 2:26 PM, dennis wolfe wrote:
> >
> >>
> >>
> >> The drag IS that much different. I bet it doesn't take 10 or 15 hp
> >> to power a 3000# Prius a steady 60 mph. It takes 330hp to hold a
> >> steady 60 on a #3000 modern deep V planing boat.
> >>
> >> ----- Original Message -----
> >> From: sv
> >> To:
electricboats@yahoogroups.com <mailto:electricboats%40yahoogroups.com>
> >> Sent: Sunday, October 10, 2010 12:02 AM
> >> Subject: Re: [Electric Boats] Want to convert a glasstron 184 to
> >> electric. Any advice?
> >>
> >>
> >> i'm new to this list and electric boats, but intrigued. Makes
> >> sense, and great simple explanation. But I am wondering how they
> >> are getting 2000# plus elec cars to move at 70mph, and without 100-200
> >> batteries? Can't that tech be used in boats? Yes, drag of water is
> >> worse than tires on pavement, but is it THAT much difference to cause
> >> such a big drop in MPH? I guess a lot is lost with the nature of a
> >> prop as well vs 4 rubber tires on pavement. But maybe the motors
> >> they are using in these elec cars would be stronger and more efficient
> >> as I/O's in boats - vs elec outboards? I'm sure there's lots of
> >> considerations I'm missing.
> >>
> >> On Oct 9, 2010, at 7:24 PM, dennis wolfe wrote:
> >>
> >> >
> >> >
> >> > I wouldn't do it. A deep V hull is designed to go fast (with a lot
> >> > of HP) and ride relatively smoothly over waves. Your boat has 165
> >> > hp and the engine, I/O and a full tank of gas weigh less than
> >> > 1000#. It can probably run a couple of hours at wide open throttle,
> >> > maybe 40 mph. The total boat weight is around 2000#.
> >> >
> >> > 165 hp = 120 kW, this much power for 2 hours = 240 kWh. A 60# lead
> >> > battery holds 1.3 kW and costs $100 to $250. For equal power you
> >> > would need 185 of these batteries; over 5 tons and $20,000! This is
> >> > why there are no practical electric speed boats.
> >> >
> >> > If you had around $5000 to spend on an electric drive system,
> >> > including batteries, you would want a displacement hull, like a sail
> >> > boat, around 18 to 24 feel long. You would be able to cruise around
> >> > at 5-6 mph for 5-7 hours on a charge. If that is the kind of
> >> > boating you want to do electric would be a good choice. There is no
> >> > substitute for the magic of moving along in near silence but you pay
> >> > a steep price in speed and range potential.
> >> >
> >> > Denny
> >> >
> >> > ----- Original Message -----
> >> > From: Stef Mob.
> >> > To:
electricboats@yahoogroups.com> > <mailto:electricboats%40yahoogroups.com>
> >> > Sent: Saturday, October 09, 2010 5:26 PM
> >> > Subject: Re: [Electric Boats] Want to convert a glasstron 184 to
> >> > electric. Any advice?
> >> >
> >> >
> >> >
> >> > So, in short words: don't do it?
> >> >
> >> > Is there a equation point? In other words: with a dc motor of xxx
> >> > hp, it Will be great?
> >> > Or do i just need to look for an other (type of) boat.
> >> > I thought a V-hull would be great? ( as they make a speed boat of
> >> > it...?)
> >> >
> >> > How can i compare gas and electric motor power with eachother?
> >> >
> >> > Thanks.
> >> >
> >> >
> >> > Op 9 okt 2010 om 22:49 heeft "dennis wolfe" <
dwolfe@dropsheet.com> > <mailto:dwolfe%40dropsheet.com>>
> >> > het volgende geschreven:\
> >> >
> >> >>
> >> >>
> >> >> First do this thought experiment: Take out the old motor (500#?),
> >> >> add 1200 lbs batteries. Now clamp a 10 Hp outboard on. Put on
> >> >> really good ear plugs. At WOT you would get maybe 6-7 mph for 60
> >> >> - 90 minutes. Maybe 4x run time at 4-5 mph. That's what your
> >> >> electric boat will be like. If that seems good to you go ahead.
> >> >> You are looking at several thousand dollars for a motor and
> >> >> controller that big. You would need a hefty charger too.
> >> >>
> >> >> Old deep V fiberglass hulls are a dime a dozen but are the worst
> >> >> possible hull form for efficient electric power. A boat shaped
> >> >> like a big canoe (think old sail boat sans keel) is the best design
> >> >> for easy propulsion.
> >> >>
> >> >> Denny
> >> >>
> >> >> ----- Original Message -----
> >> >> From: stef
> >> >> To:
electricboats@yahoogroups.com> > <mailto:electricboats%40yahoogroups.com>
> >> >> Cc:
stefwesbeek@tiscali.nl <mailto:stefwesbeek%40tiscali.nl>
> >> >> Sent: Saturday, October 09, 2010 6:22 AM
> >> >> Subject: [Electric Boats] Want to convert a glasstron 184 to
> >> >> electric. Any advice?
> >> >>
> >> >>
> >> >> Hello,
> >> >> I've been leeching the group for a few months now, and became
> >> >> enthousiast in electric boating.
> >> >> Currently have a inflatable with an little outboard electric, and i
> >> >> really love the silence, and the ease of boating. (never expected
> >> >> that..)
> >> >>
> >> >> Now, i can get 32 batteries AGM 12V 80Ah for free from a relative
> >> >> (4 years old, come from a no-break system), so i want to convert a
> >> >> boat to electric.
> >> >> Currently, i found a Glasstron 184 with a broken engine, but in
> >> >> exellent shape, and overhauled tailpiece.
> >> >>
> >> >> Can anyone give me advice about motorising this speedboat?
> >> >> I was leaning towards a 10 to 20Hp series wound dc at 96 volts,
> >> >> with 3 battery banks in parallel, giving me 96V and 240Ah.
> >> >>
> >> >> Any ideas, or recommendations, before i actually purchase the boat?
> >> >>
> >> >> Biggest question is if the hull of the boat is capable of being
> >> >> thrusted by electric, instead of the original 165Hp six cilinder
> >> >> inline...
> >> >>
> >> >> Many thanks!
> >> >>
> >> >>
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >>
> >
> >
>
>
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