The static water length of a Cherubini h27 is 22 ft. The time honored formula of 3.14 X the square root of the waterlength indicates that all boats of a 22' waterline have a hull speed of 6.2 knots. Now we know that all boats are not alike and that a sleek hull will go faster than a wide fat one. Also when the boat heels its water length may increase so the target figure you may be looking for is highly elusive and perhaps somewhat irrelevant.