Hello Reino,
Thank you very much for transfering me to these sites!
Roland
To: electricboats@
From: reino.urala@
Date: Tue, 30 Jun 2009 13:38:31 +0300
Subject: Re: [Electric Boats] new member and, of course, questions
Roland,
heating = poor efficiency!
A good permanent magnet DC motor efficiency is about 90%. For instance
my motor:
http://www.perm-
Good and expensive!
Or this:
http://www.electric
Good and some less expensive!
Good smaller power rating motors must exist, but I do not know about them!
This 4HP 24 motor:
Poor efficiency here too = 45amps @ no load (!).
RPM may be too high for you? Present RPM? Motor can be used at lower
RPM, but efficiency is worse, and power is smaller.
redu
Roland Kruijer wrote:
> Hi Reino,
>
>
>
> I was looking on the net I came upon this motor. http://cgi.ebay.
>
>
>
> Now, as I told I'm not that a electrician, but would this be a good motor. I am considered about the amp's on load?? Forgive me if I am asking the wrong things, but thats my problem. What do I need and what should I look for as in motor.
>
>
>
> Ok, thanks again,
>
>
>
> Roland
>
>
>
> To: electricboats@
> From: reino.urala@
> Date: Tue, 30 Jun 2009 08:47:54 +0300
> Subject: 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.electrab
>>
>> 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
>>
>>
>>
>>
>> ------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
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> ____________
> Haal meer uit je leven met Windows Live
> http://www.microsof
>
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>
> ------------
>
> Yahoo! Groups Links
>
>
>
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>
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