Effect of primary wind propulsion on ships' main engines

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CPP has been around and widely used for many years:

Controllable Pitch Propellers (CPP)

CPP for smaller ships and boats has been around for a century, but CPP for larger ships a few decades: 1935 Liaaen (later acquired by Ulstein) develops the first controllable pitch propeller. The Heliston propeller range is introduced with cavitation-reducing blade shapes. Ships include Aquitania, Mauretania, Queen Mary and Queen Elizabeth. A.M.Liaaen patented their CPP for large ships in the US in 1972: https://www.freepatentsonline.com/3640644.html A.M.Liaaen CPPs were supplied to several…