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Old Nov 13, 2009, 05:29 PM
cyberhoops is offline
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Joined Feb 2006
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I can think of a couple factors working against high rpm motors in boats.

For 10300kv in a micro ducted fan you have low resistance turning in air and water is 80x more dense and would require a very very small prop - and there are practical limits to prop size.

Another factor with a small prop is slippage since slippage will increase dramatically at some point if the prop is too small for the boat.

Acceleration will also suffer with smaller props.

For a given amount of power it is easier to run something with 6s with 100 amps rather than 2s and 300 amps, which generally means a lower kv motor on higher voltage.
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