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So at least you now know what will work on average. 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. This is called Archimedes Principle. The weight slightly differs in saltwater from freshwater, because saltwater is heavier. In saltwater, the boat gets a bit lighter.
So in theory you can use a smaller engine for a bluewater boat, but in practice this is offset by the stronger current and wind. Most manufacturers simply give you the displacement of your boat. If you can't find any data, because, for example, you own an old boat, you can weigh your boat on a truck scale. You can also haul it out and measure it which is painstaking work. Tip: if you're gonna weigh your boat, simply drive it onto a truck scale, and retract the weight of the trailer from the total weight.
Of course, it's not so simple. This formula gives a rough estimate. But for me this was way clearer than all that black magic that I get when I ask people what size engine I should get. Two-stroke engines fire once every revolution and four-strokes fire once every other revolution.
This makes the 2-stroke twice as powerful. They provide more torque at a higher RPM. But they also wear more quickly. The 4-stroke will last you a lot longer, and its also more fuel efficient. The right propellor size is just as important as having enough horsepower. With a smaller prop diameter, it has to work harder to generate the same propulsion as a larger diameter. But you can't just go larger always.
The prop affects the RPM of your engine, and you have to get in the right range more on this later. You also have to check the maximum diameter that fits your boat. Diesels have more torque, because the compression rate is higher than that of gasoline engines. So if you consider a diesel, you can do with less HPs. High windage hulls multihulls need a bit more. A multihull or larger hull in general suffers from more friction because of the larger surface. So the engine needs to work a little harder.
If you sail longer distances under power , or against the wind it's a good idea to get a larger engine but not too large. This helps you to save on fuel since you have lower RPM. Especially if you sail offshore or on open sea. The engine needs to work harder due to stronger wind and current.
Smooth hull designs need less HPs than bulky hull designs, like the classic wooden clippers and crabbers for example. So why not get the smallest engine and get the best fuel economy? There are a couple of advantages to getting a slightly bigger engine:.
To perform optimally, an engine should get up to speed. This kills fuel efficiency and also the cooling system won't operate optimally. The propeller size is very important for the RPM. If your prop diameter is too wide, the engine can't get up to speed and struggles to build power. Bad for fuel economy, bad for the engine, and bad for performance. If you struggle to get to high RPM, your prop is too large. If your engine is constantly in the red, you're underpropped.
So don't go too big on the prop, but also don't go too small. The easiest way to get it right is to check the engines manual and see what the manufacturer recommends. You can definitely go too big on a sailboats engine. An overpowered yacht doesn't make any sense. True, it can look cool, but it can't feel cool. Every displacement hull has a maximum hull speed. That means that it cannot go any faster than the max speed. So if your engine can cruise at that speed, it's not getting any better.
The problem with displacement hulls is that they displace the water, or in other words: they push the water in front of them. They cannot move any faster than they can push away the water. And because the resistance increases as speed increases, there's an absolute, physical speed limit for each keelboat. Fun fact: the longer your boat, the higher the hull speed. Want to know the maximum hull speed for your boat? You can find it in this article. Bear in mind that a large engine also has the following disadvantages:.
As long as it gives you enough control and good handling, it will get you there. If you give up on going fast, you can actually get really good fuel economy and your engine will last you probably 20 years. If you want to go fast, a sailboat is not the right one for you. You should instead get a powerboat.
I'm just kidding. Do sailboats have motors? Most sailboats are power assisted boats, which means they have a small auxiliary engine to cruise in light air. When a sailboat is sailing under engine power, it is considered a motorboat and it doesn't have right of way. In other words, you get what you pay for. Power is also instant, and there is no requirement to warm them up before leaving the dock.
In terms of range�a concern for many�higher-quality lithium-powered models can be discharged much further than a cheapy lead-acid powered trolling motor, meaning they can run up to hours at half-throttle with a range of around miles. Charging times are around 10 hours. Despite recent advances, four-stroke gas outboards remain the standard.
Shaft Length: Most small outboards are available with a choice of two or three different length shafts. For the average inflatable, a short shaft is fine. Longer shafts are really designed for high-transomed, rigid fishing craft or small sailboats. Propellers: Manufacturers will offer a choice of props, but usually recommend a relatively shallow pitched one for general tender use. Sailboat outboards will normally be supplied with a deeper pitch prop for more drive at lower rpm and better displacement when stopping or reversing.
Smaller hp motors often only have forward and neutral F-N , requiring you to rotate the entire outboard through degrees to go astern. Throttle: All modern portable outboards now come equipped with twist-grip throttles on the tiller. Electric models also have a forward-neutral-reverse F-N-R selector on the tiller that selects the direction of travel by simply turning the grip clockwise or counterclockwise, with neutral being between the two.
Shallow water drive: Pretty much standard on all small outboards, this feature allows the leg to pop up in the event of a grounding. On a model with a reverse gear this should also automatically lock the leg to prevent it lifting when going astern. What follows are some of the leading outboard brands and what they have to offer up to 10hp now on the market. Smaller gas-powered outboards like these are the true workhorses of the cruising community. Apart from its little 2. Other features include an internal 0.
The fuel pump, filter and carburetor drain are easily accessed, plus they have automatic decompression for easy starting and a low oil pressure monitor with LED indicator that limits revs to 2,rpm.
Improved engine mounts reduce vibration. The large handle and fold-down tiller are ideal for stowage. All made to the same designs and built in Japan, the Tohatsu is the base model for the popular Mercury and Mariner brands, although they offer various different control features.
The 2. The 4hp motors and larger have front-shift F-N-R gears, start-in-gear prevention, a remote tank option, through-prop exhaust and low oil-pressure alarm. It also has F-N-R gears. The larger capacity 8.
With auto-decompression start, a remote fuel tank option, thermostatic cooling control and an oil leak prevention system when stowed, they also pack in a lot of nice features. The lightest of them all the 2. Evinrude offers a small, lightweight 3.
The outboards are less sophisticated than some the 6hp, for example, lacks a reverse gear. But they are soundly built and easy to maintain. Lerh left has been a leader in popularizing the use of propane in outboards; Mercury right offers the option of propane as well.
The first to introduce a dedicated range of propane-powered outboards, the Lehr 2. They both accept either a simple 16oz Coleman-type propane canister or can be connected to a larger remote LPG container. Other, higher horsepower models are also available.
Tohatsu and Mercury have introduced a pre-converted range of 5hp propane outboards that boasts all the features of their regular 5hp gas models and are operated using a remote propane tank. These Mirror Dinghy Outboard Motor Size Limit electric outboards built by from left E-propulsion, Torqeedo and Electro Paddle are truly up to the rigors of cruising. These are well-proven German made outboards with high-capacity Lithium batteries and myriad useful features, such as a GPS display that gives speed, charge status, range remaining, magnetic kill switch, solar charging and more.
Having been in the business a number of years now, the company has ironed out any bugs that may have plagued it early on to create a truly seaworthy rock-solid product. Chinese-built equivalent of the Torqeedo also employs Li-ion batteries. The U.
It is best suited to powering smaller dinghies with small payloads over short distances. It stows compactly and is incredibly simple both to use and to lower and retract when approaching shore. The sky is dark, and the air cold. Measuring 20 degrees deadrise at the It was blowing 25 knots when the inner forestay let go. Eclipse, my Tayana 42, was screaming along on a broad reach just south of Saint Thomas. I had gone to raise the staysail, and upon putting a slight strain on the hanks, the stainless wire separated from its swagged We spend so much time with the finished product that it's easy to gloss over how much work and innovation goes into making a single sailboat.
Today, we're taking a look behind the scenes with our friends at Lagoon as they show us the build for their new There's something A few years ago, Jeanneau set about the business of revolutionizing its storied Sun Odyssey line when it introduced its SO and models, designed by Phillipe Briand.
Building on that momentum, the French builder has since passed the baton to a new designer, Marc Lombard, One thing nobody really expected when the pandemic hit last year was skyrocketing boat sales.
Power and sailboats alike have sold like hotcakes in all sizes, from tiny rowboats to large long-distance cruisers. Everyone it seemed, was going to create their own on-the-water Everything offshore is subject to wear-and-tear, including the head of your furling genoa.
Enter the JibCap, a Olympic Sailing. Cayard, best known for his seven America's Cup campaigns, has also been heavily involved in Olympic Sailing as a two-time Olympian in and He finished fifth in the Digital Boat Show. Cruisers 30FTFT. Cruisers Under 30FT. Racing Boats. Dinghies and Daysailers.
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