<br /><br />If you go with the homebuilt formula you get 120 hp as an answer also.<br /><br />I was told by the local boat dealer (I trust this dealer) That if you put any new 90 you will know it! As a new 90 has 20% more power at the prop than the 85.<br /><br />From what I have read the boat at sea level runs 35-37 mph with a 17 pich prop @5200-5500 rpm.<br /><br />At my altitude I have to drop to a 13 pitch to get 5400 rpm. thats at 30 mph.<br /><br />The guys with a 90 Evinrude run a 17 pitch prop on that engine but at sea level the run a 21.<br /><br />My guess is I would see 40 mph with a new Evinrude 90 and a 17 pitch prop. My guess is very acurate BTW.<br />I ran the number through a prop slip calculator and is was dead on @ 8% slip. Basically a great hull! <br />The boat weighs 1400 Lbs. I weighed it! Trailer weighs 598 Lbs.
