[simne]

Kilowatt is ~ 1.3 hp, so 600W = 0.8HP.

But, here important, that electric engines have much better torque on low rpm, even exist electric engines which give high torque just from zero. Also it is typical, to overdrive electric engines for short time.

And other important thing, aging - electric engines could nearly not have aging at all, but gas engines have significant drop of power/torque at hundreds of hours of work, even if properly serviced.

Overall, You will really not see gas engine claimed power, but something much less, ~ 70-90% in good cases. But in case of electric engine, it will not only give claimed power, but could make up to 100% boost for limited time.

[AlexandrB]

I don't know much about marine motors but, unlike for ground vehicles, I don't think that having a ton of starting torque helps in a marine environment. The torque required probably increases as the propeller speed increases which matches traditional ICE engines much better than DC motors.

[simne]

UNLIKE for ground vehicles, marine and air.

- From tutorial for auto engineers: "more than 90% of time, auto engine working at fast switching conditions, and extremely low load, near zero", vs marine (and air), where prop does near linear load-rpm function at working diapason.

[simne]

BTW, because autos special requirements, there widely used turbo-compressors, but they are rarely used in marine motors and not too distributed in air.

This is because, turbine only eat power and does not give anything at low rpms, only effective on medium-high diapason.

For planes, turbine only gives an increase at significantly high altitudes, so, for example, typical light plane does not got improvement if flight on typical 1000-2000m, but got if go much higher, 5000m and more.

[kortex]

What is "diapason"? I looked it up and the closest definition was "a burst of sound", the rest pertained to pipe organs.

[nickserv]

I'd only seen the word used for musical instruments, where it refers to the scale length and/or the tonal range. Seems like here the same general idea when applied to an engine refers to its operational RPM (frequency) range.

[simne]

Band, range.