I’ve been trying to get my head around how to figure out what kind of speed to realistically expect from different types of boats. I know there’s a lot that goes into it (length, hull shape, engine size, weight, etc.), but is there a simple way to estimate roughly how fast a particular boat might go, especially if you’re shopping used and don’t have exact specs?
For example, how much of a difference does an extra 10hp usually make on a small runabout? And if a 20-foot sailboat has a 6hp outboard, what speed should you expect motoring in calm water?
Also, does anyone have tips for “reading between the lines” on for-sale ads when it comes to speed claims? Sometimes I see numbers that seem wild. Would love any rules of thumb, calculators, or personal experiences!