Re: 16 ft Lund Boat Kicker
Like most things, once I get engaged I spend a lot of time researching the topic.<br /><br />My findings are:<br />(1)-I calculated my hull speed to be 5.4 knots. If your not going to be planing that seems to be the practical limit of how fast the boat can be pushed.<br />(2)- I calculated the Hp required for that displacement to be ~1.8. No wind, current & 500 lbs misc weight. (passengers included) Total weight for the boat, 50 HP & new kicker is ~1450 lbs.<br />(3)- I know my boat with a 50 hp four stroke doesn't have a lot of excess power so weight is important. The Honda 5 Hp, 4-stroke, with 1 cylinder weights 61 lbs compared to a 83 for a Yamaha 6 hp with 2 cylinders. Let's assume the Honda is the one I choose.<br />(4)- The theoretical speed for that motor is 14.69 knots. (~15.23 for the Yamaha). In the real world there is prop slip & that equals about 45%, so the calculated speed for the boat is 8.08 knots. There should be a match between the hull speed and the motor speed because they ultimately have to move at the same speed. With too much HP you end up wasting a lot of fuel for a marginal increase in speed.<br />(5)- With the Honda I have 2.6 extra Hp in my back pocket for wind etc or almost 50% safety factor based on the 1.8 hp requirement from above.<br /><br />Briggs & Stratton also have a 5 hp 4-stroke on or two pounds lighter for about half the price. Anyone have any experience with these?<br /><br />My other question if the Honda 1 cylinder will vibrate a lot more than a 2 cylinder?