so then i wonder if anyone out there is working on some technology
that will minimize that water to clear coated fiberglass drag? Some
sort of equivalent to surf board wax or something. Maybe something
that is factory applied but reacts with the water in a special way to
reduce friction. and I wonder if anyone has studied the drag
differences between identical fiberglass and aluminum hulls. I'll
get right on it.
On Oct 11, 2010, at 2:46 PM, wes malone wrote:
>
> To see the difference in drag between a car and a boat, take any
> planing boat, run it at any speed above idle, pull the throttle back
> and see how far it will coast at that speed. When you take your foot
> off the gas peddle in a car it will coast. See what the boat does.
> You will see the difference in drag
>
> --- On Mon, 10/11/10, sv <svsv8002@gmail.com> wrote:
>
> From: sv <svsv8002@gmail.com>
> Subject: Re: [Electric Boats] Want to convert a glasstron 184 to
> electric. Any advice? [1 Attachment]
> To: electricboats@yahoogroups.com
> Date: Monday, October 11, 2010, 3:31 PM
>
>
> haha - if you only knew......
>
> i have that very problem with my boat (talk about drag):
>
>
>
>
>
> 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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