When it comes to HP, bigger is not always better. If you swap out your outboard motor for a more powerful one you risk damaging the boat, losing control, and worse. In fact, every boat is required to have a maximum horsepower rating. Too little horsepower and you can burn your engine out far too quickly. The general rule of thumb for horsepower is that for each horsepower you need about 5 to 40 pounds of weight. It relates to size and hull shape as much as everything else does. A number of factors affect how much horsepower is ideal for your boat. Horsepower works out to 550 foot-pounds per second. For instance, average runabouts have a Crouch constant of 150. This number is something boat designers use when designing hull types. You’ll also need to include Crouch’s constant which varies based on the kind of boat we’re talking about. You’ll need to know your boat’s shaft horsepower as well as its displacement. Even if you never need to write it out by hand. However, we thinking knowing the basics behind how and why the calculator works is important, too. And why a calculator tool is so much more helpful. This is why most of us don’t like to calculate it ourselves. You’ll need to know a handful of factors when calculating boat speed. Let’s take a look at what you need to know. Plus, what if you want to know before you get on the water? Fortunately, calculating boat speed doesn’t have to be that hard. But it’s not always going to be available, especially if there’s a service disruption or an issue with your power. It does all the work for you with just a glance. GPS is a good way to figure out your boat speed with no effort. And, just as likely, we don’t think we need to. Most of us want to know our boat’s top speed but don’t know how to calculate it.
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