Sunday, May 21, 2017

Re: [Electric Boats] Re: Kits for larger sailboats

 

Mike 
Your numbers were exactly what I needed.
A brilliant engineer gave me some battery stats n terms of performance that scared me to death as to weight for the scenario of performance I wrote on a wish list for the SF bay.
All Righty then....
By chance do you have the data that matches those performance numbers for those 30's
in terms of the battery numbers needed by type? flooded, AGM, etc.etc. in your amazing calculations? I'm removing two 2800 lbs engines and the transmissions say another 600 lbs
the diesel generator is gone it had to be taken off by crane sat another 800 lbs and already
removed two steel fuel tanks say another 600 lbs and the 450 gal X fuel weight is now gone. 
Now Then.... Time for that Nautical engineer according to the ship guys I Know.
It has been suggested that I now have ballast weight issues and could easily roll the boat in chop. My dimensions are Chris Craft Commander enclosed sedan I.E. no fly bridge.  47 long and 15 wide and a whopping 39 inches (loaded) of draft. That will be WAY WAY less once the engines and trans well over 6k come out and it has already 8ish inches out of the water.
My exhaust that used to be half in, half out of the water now its 3 inches in the aft higher than that. as it is right now. I'm wondering if the props will be kissing the surface  in two foot chop right now. 
Top heavy in Amsterdam maybe ? but in our area?  the ship or ferry wake twenty or so
minutes old just rolling across the water used to make my 32 Luhrs 12 wide (diesel ) with Fly bridge, (a really heavy boat ), rock back and fourth. Even with a conventional gas set up, I am way to light. 
That Said. 
A tape measure to figure out where to put ballast and Air bilge volume needed for all the battery fumes / gases. Then some NASA designed battery monitoring system for all the banks, to not damage the batteries ? and Charging them all ? OMG, timelines on how long that would take ? Yikes
And still after all that, thinking it might work. what a sicko hu....LOL  

On Sun, May 21, 2017 at 8:38 AM, mike@electricyachtssocal.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

I am not sure what sailboat you are considering buying but there are three companies that i know of that appear to drive a boat in the 48ft 30000lbs range up to hull speed.  I will point out that a 48ft boat at 30000lbs.  We evaluate a system dry weight numbers and not the fully loaded numbers understanding that the sailing weight is greater.


System Speed & Power (LOA 48ft, LWL40ft, beam 14ft, Displacement dry 30000lbs(loaded likely 15% more))                       

Kts          Watts

2.6          960

3.8          1920

4.6          3840

5.1          5760

5.9          7680 Recommend a 10kW genset for this continuous speed

6.5          10560 Recommend a 15kW genset for this continuous speed

7.1          14400

7.8          19200 This is what a 20kW system would provide

8.4          23040 hull speed reached at about 24kW

Hull speed          8.47       

 

Dedicated Marine system (kits not evaluated)

Bell Marine has the 30kW system at 144v liquid cooled (peak is 43kW continuous is likely the 30kW) reduction gear, I believe it is an ac induction motor and I would estimate 350lbs.  can be placed in series


Elco has the E70 is a 108v system peak 51.5kW and continuous 29kW air cooled direct drive induction ac motor system, 650lbs (number of installation unknown – I also believe you can get it as a 94v system at less power)

Electric Yacht QuietTorque 40.0 96v air cooled dual powerheads peak 38.4 continuous 32.6kW, PMAC motor system. 155lbs (over 20 installations of boat over 25000lbs dry) - most of the larger installations are 48v QuietTorque 20.0 systems.  Can be placed in series

Please add to this list as I suspect there are other especially from Europe of similar size.

Mike

Electric Yachts of Southern California/Pacific


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Posted by: Dan maitland <captmaitland@gmail.com>
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