Joe, my electric system from Scott McMillan of ElectricYachts weighs in
at about 70 lbs. My old Volvo Penta MD10B was a good 350 lbs with
transmission. I have less than $5k in my system, and to rebuild an
Atomic 4 or Volvo is about 6 to 7K depending on how much labor you do to
take it out and deliver it to the shop. I know I can not reach 75 miles,
but hopefully this new field of electric propulsion will develop new
batteries and new charging systems to enable a 75 to one hundred mile
range.
On Tue, 6 Oct 2009 18:45:10 -0300 <joec_43@hotmail.
I don't know about that, my Atomic 4 weighs in about 300 lbs, has a 10
gal gas tank, with a range of 75 nautical miles. The deeper I look into
this, it appears the time is not yet here for cruising with electric. I
have quotes on two systems, and they both seem to weigh in around 400
lbs, plus the batteries.
Joe
From: postal6@juno.
Sent: Tuesday, October 06, 2009 5:56 PM
To: electricboats@
Subject: Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat
Usually electric propulsion systems are less weight than the original
gas/diesel set-up. Most sailing vessels utilize two batteries, and the
addition of two more is less than the weight of a half filled gas/diesel
tank. And comparing the weight of a gas or diesel engine, with
transmission, to a Mars electric motor is quite a drastic weight
differential. Less weight, less chance of flammable explosion, would
make any insurance entity happy. And if lead cell batteries cause a
safety concern, alternative
batteries are available.
Don Swanson
On Tue, 6 Oct 2009 20:48:56 +0200 "Alan Ford" <alanford@global.
writes:
Gday all
Replacing keel mass ( in a sailing vessel) with batteries is going to
affect your boats stability curve, and quite possibly then any insurance
cover you may have, as you are altering an original design parameter
pertaining to safety.
rgds
Alan
----- Original Message -----
From: aweekdaysailor
To: electricboats@
Sent: Tuesday, October 06, 2009 6:17 PM
Subject: Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat
Futher confirmation that the "sweet spot" - sailboats < ~30' holds.
The combination of cheap mass-produced components (golf carts...) in the
appropriate power range (6HP) and the ICE weight-credit to
energy-capacity/
that, and the power requirements start to overwhelm the load-bearing
capacity of the vessel using lead-acid and the budget of the owner if
using LiPO4.
AC Motor with AC generators maybe? It's just a series-hybrid at that
point but could still be supplemented with a big inverter/charger and a
moderate battery-bank for harbor maneuvers.
Denny has suggested taking some weight off the keel to compensate - that
would help push the envelope to larger boats. In fact the first time I
read about an electric conversion it was a concrete-keel Rawson 30 where
the owner had chisled out the concrete to make room/capacity for the
batteries. Not too many of those available unfortunately, so we're left
with chopping lead (or iron...)
Hollow (filled fiberglass) keels on some boats?...hmmm.
Any marine architects on the list?
-Keith
--- In electricboats@
> I received two prices for converting, and without batteries, is getting
close to $12,000 US. Out of my ballpark, and no savings in the long run
at all.
>
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