[edNorth]

Completely irrelavant comment. Lacks all Aviation content. We are discussing that are we not, no? Derating (e.g. helicopter engines) was done in order to improve reliability by pulling less power.
The comment made by other commenter contained prior known, what obscure work exsperiance (already has written so, but yet no known proofer) and suggest matörish writer no own research.
Just slander. Move off. Nothing to happen here.
I am published (native language and tiny the other Sprache oder Zwei) I know of the rules of books (and how to write them). Also know some very bad ones.
Worked my own layout back over 30 years ago. And am conneted and have contributed stuff to many others in both Britain and Germany. Some members here know.