The hard chines push water into the valleys and ridges formed by the frames. The acute angles beneath the waterline help the boat soar over the water, while the multiple chines counter the effect of rolling waves.īut because there’s more than one hull, multi-chines are classed as displacement hulls. These chines can be parallel, identical, or have mixed sizes, and are ideal for speed sailing. Multi-chined hulls can have twin or triplet chines. A V-bottom hull can have a single V or several smaller ones strategically arranged for maximized boat balance. Think of it this way – the V provides a wider surface for strong waves to push against, so the boat has to be fast and powerful enough to counter that roiling motion. These boats aren’t as stable at slow speeds because the rolling waves can topple the boat. While sailing, the nose of the boat stays visible above the waterline. V-bottom hulls are routinely combined with a powerful motor, which makes it even easier to zip above the waves. This hard chine is good at cutting through currents and riding over the waves. That triangular base is where the hard-chine name comes from because it’s a sharp or ‘hard’ angle of 6° to 23°. While flat-bottom boats are often displacers, v-bottom boats are better at planing. Small rowboats, rafts, kayaks, and paddle boats often have flat-bottom hulls. They work well on calm waters, so flat-bottom hulls are mostly used inland on large lakes and secure bays. Or they may have an angular front and a reversed bell-shape back.įlat-bottom hulls are categorized as displacement hulls. That flat surface does drag the boat though, so flat-bottom hulls often have a pointed bow and stern to push the water more effectively. This means they’re sturdy and stable, sitting low and moving slow. a distinct v-shape, which is the harshest angle and is therefore called a hard chine. This can be flat, slightly curved, fully rounded, or sharp and acute (e.g. Just to refresh your memory, the chine described the angle at the outer bottom of the boat. Let’s look at the specific boat hull types, noting how they intermingle. Semi-planing / semi-displacement hulls fall in-between. They ride high above the waves and seem to skim the water. Finally, displacement hulls have a wider, heavier base designed to push water aside at lower speeds.Ĭonversely, planing hulls are streamlined to slice through the water at faster speeds. And soft chined hulls are sometimes described as molded, curved, rounded, or smooth hulls. Hard chined hulls are sometimes called chined (without the word ‘hard’). Let’s start with the word chine, the angle at the bottom of the hull. This list will expand on any overlaps between the hull classes. Just to make sure we’ve covered all the boat hull types, we’ve compiled them into a single list that cuts across the categories. You can also classify hull types based on the number of hulls under the boat. And s-bottoms are sometimes labeled as rounded bilge hulls or smooth curve hulls. For example, a v-bottom hull is sometimes described as a (hard) chined hull. A Comprehensive List of Boat Hull Typesįirst off, let’s look at the broad hull divisions.
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