![]() In saltwater, the boat gets a bit lighter. The weight slightly differs in saltwater from freshwater, because saltwater is heavier. The weight of the boat is the same as its displacement, because the weight of any object is exactly equal to the weight of the water it displaces (aka: pushes aside). Maximum hull displacement is the weight of the boat when it's fully loaded, including crew.Hull displacement is the weight of the boat, or the amount of water the boat displaces.So at least you now know what will work on average. Usually you don't need anything over 30 HP. Remember that you don't have to overpower a sailboat. But you know, salespeople always recommend the Turbo version. If you're serious about getting a new engine, I definitely recommend to get advice from an expert. The hull design, sailing conditions, and your personal preference are all very important. There is no one formula to get an exact number. ![]() But remember that these are all rough estimates: I just try to give you a ballpark figure. But generally, these engine sizes will work with the following weights: Weight And of course, a lot of other factors come into play (more on that later). If you want to get it absolutely right, you also need to correct for propellor size. So you have smooth water, no windage, a clean and polished hull, and so on. Here, HP is the amount of horsepower you need to reach the maximum hull speed. So 1 HP for every 550 lb displacement, and 4 hp per 2200 lb. The amount of power you need is related to the hull displacement of your boat. That's great news (unless your ultimate goal is speed), because it's cheaper to buy, cheaper to drive, and cheaper to maintain. Sailboats need way smaller engines than powerboats. Other Factors That Are Important for Size.It's our mission to get decent speed, good control over the boat, and the best possible fuel efficiency. They need more power than flat bottoms.īut they're not powerboats - so it's not our mission to go fast. We're talking about displacement hulls here, so in other words: keel boats. In this article, I'm talking about small outboard engines for sailboats. Most sailboats don't need a motor with more than 30 HP. You need approximately 1 HP per 550 lb of displacement or 4 HP per 2200 lb. How to pick the right outboard motor size for your sailboat? To get the right amount of horsepower needed to efficiently propel a sailboat, divide the displacement of the boat (in lb) by 550. I was done with complex calculations and tried to make it easier here. It seems so complex to pick the right engine size for your sailboat.
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