[FLexpat]

Originally Posted by captainDH

sounds high, got a t-top with enclosure that stays on year round, im hitting around 45-47 now , was thinking an honest 12-14 mph gain, upper 50s for sure and not surprised to kiss 60- 65-70 mph seems high, but giddy up girl!!
i mainly want just a faster cruise (inshore). i cruise 26-27 knots now at 4200, should be around 35 knots at 4200, with the 400 and a much taller screw. gonna be fun and interesting getting this beast propped. but the fuel burn will be same at 4200, but going much faster at same rpm/fuel burn, therefore much improved mpg. that's what i really like, and 6 years warranty, whereas i'm out warranty now.

I think you are pretty close; T-Top w enclosure is lots of drag - would probably cost 10-15% in speed over a 'bare' boat.