In article ,
"Roger Long" wrote:

If a diesel is sized such that the boat can almost never
use the full power, it will never get up to the proper operating range. If
the prop is too small, as is often the case with yachts, even a headwind
that nearly stops the boat may not get the engine into the proper range.

If you knew ANYthing about modern Diesel Engineering, you would KNOW,
that diesels get up to "Operating Tempratures" at loads of between
5 and 10%, and then the Cooling System dumps the rest of the BTU's into
the outside world, as required to maintain the engine at "Operating
Tempretures". This is why they all have Thermostats in the Primary
Cooling Loop, which maintain the engine at Operating Temprature. The
Thermostat allows engine generated heat to recirculate, UNTILL the engine
comes up to Operating Temprature. If the Cooling System is designed
correctly, this equalibrium can be achived with the engine turning
with no, or a very small load.

Bruce in alaska
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add a 2 before @