Sailing on the weekend , we were talking about engines.
The boat I was on was a 23 footer , weighing around 3 ton.
The skipper was telling me of one trip he did recently , a 32 NM open water trip under engine power all the way , working in to the wind , and a strong current , down to 2knts at times.
It took him all day , but his 10hp Yanmar didn't miss a beat , and got him there safely , as it has done the last 10 years , trouble free.
He knew he would get there eventually , but how would he have gone , if he was all electric ?.
The thing is , when you are out there , and find yourself in this situation , you can't decide "I'm not going to play anymore , I'm going home" , you have to keep on going , and deal with it the best you can.
First priority needs to be safety , we need to have the most reliable systems , because the sea can be very cruel , and cut you down very very easily , if you are not properly prepared.
Perhaps the forum moderator could devise a sliding scale of difficulty , say piddling around on a little lake is "1" , through to open water cruising at "10" , then if we qualified our setups with a number , then everyone would be able to work out if what is being talked about is suitable for them.
Just a thought.
Keep it safe , please.
Regards Rob J.
--- On Wed, 7/10/09, joec_43@hotmail.
From: joec_43@hotmail.
Subject: Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat
To: electricboats@
Received: Wednesday, 7 October, 2009, 8:45 AM
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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