T-Pain Is On A Boat: Re: [Electric Boats] new member and, of course, questions

Monday, June 29, 2009

Re: [Electric Boats] new member and, of course, questions

Hi Roland,
Reino Urala from Finland
Right now testing an el-boat with about similar battery capacity (4kWh).
Some measured reference data:
speed 4knots, range 50km, 350W
speed 8knots, range 15km, 2200W
speed 12knots, range 8km, 6000W
But this is a trimaran with small "hull speed effect"!
Note1: Increasing power means decreasing range dramatically.
Note2: Your boat is strongly "hull speed limited", and increasing power
would be much more fatal concerning speed and max. range!
Note3: A low wave drag el-boat is peculiar: You may make hundreds of km
by cruising really slowly. And you may make 15kn for short sprints.

redu

Roland Kruijer wrote:
> Hello Group,
>
> My name is Roland Kruijer and I'm from The Netherlands.
>
> I'm just entering the electric community as I bought an electric boat just a couple of weeks ago. http://www.electraboat.com/
>
> Maybe some of you know this boat or have one. I'm having a little problem with the speed of the boat. I allready changed the pulleys but as a result, the motor becomes hot, so I'm figuring that is not the way to do it. It now has a 300 Watt, 24 V electric motor which would be sufficient in a pond, but I live by a slow streaming river, there for the motor is too weak. Oh, and the batteries are 2 x 12 V 200 amp in series.
> Now, I'm searching for a replacement (bigger) motor to use. Also I read there's need for a controller?? and I'm also looking for a throttle of some kind, because the boat now only has on/off switch.
>
> I saw on the net that there are lots of electric scootermotors for sale, can these be used?
> What kind of motor should I use? The boat doesn't have to be a speedboat.
> Is it possible to use an ordinary electric motor, but instead of the 300w one with 600 or 900 watt?
> I'm a bit concerned about the power of the batteries going straight to the motor. The orriginal set-up got the motor handwarm, but since I changed the pulley, its becomming, well, hotter.
>
>
> As I said, I'm just entering this electric world and do not have experience in electronics. I'm more an automotive guy, so any advice would be great!
>
>
> Thanks in advance,
> Roland Kruijer
>
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