[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.