>jerryd wrote:
>>
>>
>>
>> Hi Rick and All,
>>
>> ----- Original Message Follows -----
>> From: Rick Willoughby <
[email protected]>
>> To:
[email protected]
>> subject: [EVDL] Electric Powered Boat
>>
>>
>>
>> Date: Thu, 25 Oct 2007 16:36:56 -0700 (PDT)
>>
>>>I am seeking advice and experience on equipping an
>>>electric boat. I have attached an image.
>>>http://www.nabble.com/file/p13418241/1t_Solar.jpg
>>
>> Interesting boat design you have. Your EV numbers
>> also are in the ballpark. The reservations I have are
>> more seakeeping, tax problems than with the charging or
>> EV drive. As a a boat designer, builder of all
>> types I'd suggest you go to a Cat as your present version
>> will probably roll very badly in any seaway whether
>> underway or anchored.
>> As for taxes most boats are taxed by length,
>> both by governments and by marinas, boatyards, ect. 26'
>> or it's equivilent in meters is a good place to be just
>> under though everything you want can be done in 20'.
>> Other choices are trimarrans or an outrigger.
>>
>>>
>>>The preliminary specification - Length is 14.7m, overall
>>>beam is 1.6m, WL beam 1.14m and displacement 1t.
>>
>> Rather narrow at that waterline at that length. Over
>> 10=1 beam to length ratio the surface friction goes up
>> too much vs wave making drag causing higher power level
>> demands. A 14.7m boat would need at least a 1.5m
>> waterline beam, WLB for lowest drag.
>>>
>>>It has a 1.2kW wind turbine and 5 X 200W solar panels.
>>>There is 9600Wh of battery storage,
>>
>> These are peak readings though you have a lot of
>> wind down there. be lucky if you get 1/2 that.
>> Or course the best wind energy generator is a
>> sail so one should have at least a small rig which in
>> heavier winds could charge your batts from boat speed
>> through your e motor set in regen.
>>
>>>
>>>I am planning on a 48V system that will give peak output
>>>of 4.74kW. This will give maximum speed of 12.4kts.
>>
>> Probably a little higher power needed than that.
>>
>>
>> Daytime
>>>cruising using storage, wind and solar should be at 10kts
>>>requiring 2.3kW. Overnight cruising using wind and
>>>solar for running and charging through the day and
>>>batteries at night requires 1.15kW to do 8kts.
>>
>> These rates probably need to be doubled due to
>> skin friction which is your dominate drag.
>> Also go for as large and slow prop as you can,
>> about 3-.4 meter dia if possible for prop eff.
>>
>>
>>>
>>>There is enough accommodation for two people overnight
>>>and will be roomy enough for four during day cruises.
>>>
>>>It seems a practical concept. Will take about AUD25k to
>>>build it. The hull is in three pieces so this will make
>>>it easy to transport and reduces the area needed to build
>>>it in.
>>>
>>>I am seeking advice on solar panels, wind turbine,
>>>batteries, motor and controls. I would like to locate
>>>suppliers of good equipment and gain from others'
>>>experience on combining these energy systems for an
>>>electric vehicle.
>>
>> Those are going to be local most likely. A good
>> PM motor if you can find one that high power along with a
>> Sevcon PM 4 quad controller will give you forward,
>> reverse along with charging under sail or anchored in a
>> river or tidal stream.
>> I'd go for more sail, windgen than solar as solar
>> is very expensive, only available 5 peak hrs/day at best
>> vs sails, windgen which will give you many times more
>> range, power at less cost.
>> So at least shorten it or better, switch to a
>> multihull to get better performance, safety and comfort
>> at less cost.
>> Good luck,
>> Jerry Dycus
>>
>>
>>
>>>Rick Willoughby
>>>
[email protected]
>>>--
>>>View this message in context:
>>>http://www.nabble.com/Electric-Powered-Boat-tf4694300s255
>>>42.html#a13418241 Sent from the Electric Vehicle
>>>Discussion List mailing list archive at Nabble.com.
>>>
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