Originally Posted by Jentine
is the standard used for normal operation. If the maximum RPM is 3200 then the operating RPM would be in the vicinity of 2500 to 2600.
Your 80% is closer to a maximum sustained than a “normal”
For instance 75% power is usually a maximum sustained power for an aircraft piston engine.
Actually percent power doesn’t track RPM exactly, but it’s not way off at higher RPM’s
However an engine will last much longer if not run so hard, the exception to that is if an engine is very much derated to start with, a seriously derated engine it’s not so bad to run nearly wide open, as wide open isn’t really “wide open” because it’s derated.
An automobile with a 6500 max RPM for example, 80% is above 5000 RPM, do you guys drive your cars in a gear
that equals over 5000 RPM continuously?
Then why would you do it in your boat?