Re: [Electric Boats] Propulsion Marine 5 KW Electric Drive

 

Dick,

That would be true.     More propeller area means less propeller slip and higher efficiency.  

However, you can accomplish the same thing by having a larger propeller turning slower.   ( A larger propeller will require a higher reduction gear ratio )  

James

On Oct 19, 2010, at 10:34 AM, Dick B. wrote:

 

Jim:

  You said: 

<   < However, as an electric drive consumes more power, the thrust per kilowatt decreases. This is because the propeller gets less efficient the faster it turns, which is a result of more propeller slip. Also, the electric motor becomes less efficient as it creates more power.>>

 

   This would indicate that a more efficient electric drive system to power a boat would be to have several motors running at a fraction of their max output driving several peopellers turning at slower speed.  Is this true?

 

Dick

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