Bayou, that's about right. We figure 5hp=1mph gain on must fishing and hunting rigs.
Cajun: Have you considered a tohatsu 40/50 hp 4 stroke. This is a test run last week. 1548 Ambush, 40/50 Tohatsu 4 stroke, 18 pitch Turbo Hot Shot prop, 50.4 mph. Has a great hole shot. I can find nothing to dislike about this engine. I have run one since last fall, love it. Quiet, sips fuel, great holeshot, great top end, not your typical 4 stroke. FIVE (%) year warranty on these engines.
https://www.youtube.com/watch?v=zrqz...ature=youtu.be
Danny