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
> 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
> > 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>
> > 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
> >> Cc: stefwesbeek@tiscali.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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