T-Pain Is On A Boat: Re: [Electric Boats] Want to convert a glasstron 184 to electric. Any advice?

Sunday, October 10, 2010

Re: [Electric Boats] Want to convert a glasstron 184 to electric. Any advice?

Well to start with once a car gets rolling all you really have to deal with is a little bit of friction and wind resistance. Boats have to push WATER not air out of the way and water is a whole lot more dense than air. On top of that most modern electric autos use LITHIUM batteries; which put out a lot more power/pound than more affordable LEAD batteries. Lithium batteries would be great.... but at the moment they're way too rich for MY pocketbook. If YOU can afford 'em, get 'em!

Then figure how many electric cars there actually are on the highway today, and what they cost. If you want to spend that kind of money on a boat of the same weight, you might get comparable performance.

It's all about the $$$$$$$$$$$$$$

Willie

--- On Sun, 10/10/10, sv <svsv8002@gmail.com> wrote:

From: sv <svsv8002@gmail.com>
Subject: Re: [Electric Boats] Want to convert a glasstron 184 to electric. Any advice?
To: electricboats@yahoogroups.com
Date: Sunday, October 10, 2010, 12:02 AM

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!
>>
>>
>
>
>