I found an interesting site: sizing the engines on a power boat.
While acknowledging that there are many models, some of which may be close, they have a simple diagram which I liked:
Tag: fuel economy
Fuel efficiency and engine size
In trying to understand important concepts like fuel efficiency and engine sizing, there are advantages to not having experience with a particular boat. People often try and generalise from what they know, so if they know a particular boat or two they will believe that most boats will be the same. In my case, ignorance could be a benefit…
Blue Nomads 