Doesn't a Roberts 37 have a modified keel
? The reason I ask is because there will be a larger penalty moving the center of gravity aft on a modified keel
boat than on a boat with a true full keel.
I wouldn't do it. Roberts designed that boat to have the weight of the engine
precisely where it is. You'll pay a large price
moving that much weight aft and up, even though the boat displaces as much as it does. I realize that it's probably not a great sailing boat as is, but why risk transforming it into something that, whether under sail or under power, only wallows?