Two other bits of info would help. Do you have the gear ratio of the transmission, and do you have fuel consumption and rpm figures for the boat at 12,13,14,15 knots?
This vessel is traveling at 1.73 S/L at 15 knots, so it's in semi plane mode, which isn't bad for a 44 ton craft, with what appears to be a very fine entry, monohedren with a lot of deadrise.
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