Hi
One large motor is more efficient than 4 – all things considered – and you have the option of replacing brushed with brushless
As a rule one large prop is more efficient at low load / low speed vs multiple small props
Using a custom motor you can match its characteristics to the voltage and amps available and the prop. This results in huge efficiency gains. For some reason many people are committed to small high revving motors rather than larger slow ones. Lower rpm/v means more torque per amp as does larger diameter. This means less amps used so longer runtime. Slow and torquey is the way to go. Electrics match ICE hp easily however, they tend to have less torque (altho a completely different and more suitable torque curve than ICE).
Andrew
Andrew australiano, mas eu viver e fazer busines na Argentina e no Brasil há muitos anos.
você idéias parecem muito bem fundamentadas e concieved para mim. Agora eu wil ser o primeiro a dizer que eu sou um engenheiro mecânico, mas vários de o jovem neste fórum são consideravelmente mais em sintonia e "em cima de" a mais nova tecnologia do que eu sou, de fato eu aprendo com eles todos os dias . Então, eu diria, Andra, você veio ao lugar certo para procurar respostas,! permanecer doente por um tempo, e eu acho que você também vai se surpreender com o que estes companheiros sabem e podem explicar, em termos reais fáceis Ok, há algumas grandes pensadores sobre esse grupo fórum
dony . . . S/V Deliverance (Bristol Cutter)
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of André
Sent: Thursday, 6 September 2012 6:06 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Motor for solar boat in brazil
Hi Gents,
I'm building a solar pontoon boat in brasil and after design the hull, the program that I used for this design the gave to me that this hull would have about 1KN (225 lbs) of resistance to 6,5 knots of speed. I have a good knowledge in hulls but not in solar systems. My idea was use 12 or 9 panels of 140W (these are the most common here), use 3 or 4 batteries of 150ah, depends of the voltage of the motor (36V or 48V). But my main concern is the motor. Is not easy to find electric motor for boats like in USA, everybody that I know bought from outside the country. But we have a lot of maker of trolling motors like minn kota. I'm thinking in use 4 motors, two in each side of 70 or 8 lbs. These motors works with 24V. To have the same power I will save 30% of money.
Whats you guys think about? Somebody already made this?
Thanks
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