Mac 26D engine horsepower required
Steve, I too have a 1989 26D. The displacement hull speed is 6.5 knots. The energy required to obtain this speed is 7 HP. Anything more is just more engine weight and more fuel consumption to achieve very little additional speed. While the 26 can go into semiplaning when overpowered downwind, the additional HP to go beyond 6.5 knots under power is MUCH greater and will yield very little for your money. For additional power against headseas, chop, and headwinds, figure an 8 HP 2-stroke (for lightweight) outboard with the largest diameter 3 blade prop it will accept. Also, the 26 is not designed to have anything larger than a 10HP outboard hanging from the transom.