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07.01.2021, admin
When I try to figure out the duration of whatever sailing trip I have in the making, I always need to know this one thing first: the average speed of a sailboat - especially with long journeys. If you have the same problem, this article is for you.
So what's the average speed of a sailboat? Most sailboats cruise at a speed of knots 4. Cruising speeds of over 8 knots are uncommon.
Different types of sailboats reach very different speeds. Of course, it all depends on wind conditions, current, and many other factors.
Did you know that the speed of a boat is directly related to its length? The larger the boat, the faster it goes. I'll explain it to you later on, but first, more on average speed. So let's get a little more into detail on sailboat speed. The most important factor in determining the speed is the hull type. I have two rules of thumb for you. The first is: the less of the boat is under water, the faster it goes.
Monohull - Your average sailboat is a monohull. Nearly all monohulls are displacement hulls. A displacement hull is under water, pushing the water away.
This allows the boat to cut through the 50 Foot Sailing Boat Trailer water more smoothly; this stabilizes the boat. If you want to make it go faster, you would have to raise the entire hull above the water. Later on I'll show you how to calculate the maximum hull speed of your boat. Catamarans and Trimarans - These are planing hulls, meaning they are on top of the water. They displace less water, which is why they are faster. But a planing hull is less stable than a displacement hull. To compensate, catamarans and trimarans have two or three hulls, which makes them extremely buoyant.
Since this is not your average sailboat I'll leave them out of this article. The second factor is the length of the boat. It's the second rule of thumb: the longer the boat, the faster it goes. Each sailboat has a maximum hull speed, which it can't exceed in theory. The hull speed is determined by the length of the boat. Please note: the maximum hull speed isn't the average sailing speed.
It's the upper limit in theory - read on to learn more. The third and perhaps most obvious factor of course is wind direction and speed. If you plan a large voyage, for example, an ocean passage, make sure to check the dominant wind and direction for your time of year. You want to make sure to have as much downwind as you can get, and a favorable current as well. This is why most sailors choose to go eastward instead of westward when sailing the world. If you want to know why going eastward is smart, I encourage you to read my previous article on sailing around the world here.
So imagine you need to get to dock in time. It's 50 miles away. You need to arrive at hours. It's currently hours. Would be handy to know at what speed you need to sail to make it in time. Great, we have a good general idea of what to expect from our trustworthy vessels.
If you want to go deeper, you can try to calculate the maximum hull speed of your own boat. Calculating the maximum speed is actually very simple. Now is the time to get out your calculator. You calculate the maximum hull speed HS by taking the length in feet lwl , get the square root, and multiplying it by 50 Ft Sailing Boat For Sale English 1. A displacement hull has a maximum hull speed. Hull speed is a theoretical speed that tells us what the maximum efficient speed is.
Everything above that speed costs a lot more energy. If you power your boat by engine, you can exceed the speed by pushing the hull over your own bow wave this requires a lot of horsepowers though, and it isn't good for your engine. If you're sailing instead, you can exceed your hull speed with the help of the weather.
Let's call these surfing conditions sounds good. This might happen to you when you're sailing downwind and the current pushes you forward simultaneously. This helps you to overtake your own bow wave. If this happens, the wavelength gets longer than the hull length: the water can't get out of the way fast enough.
As a result, the boat starts to plane, increasing water resistance at the front. Congratulations: you're surfing on your own bow wave. The increase in speed won't be mind blowing however about 1 knot. The truth is: a displacement hull is bound to its speed. It just costs to much energy to propel it through the water. It's made to cut, not steamroll the water. Because of this, they can cover quite a bit of distance.
What distance are we actually able to cover with conservative speeds? The average sailboat covers a distance of roughly nautical miles NM , at a speed of around 4. This equals miles or km. Most sailboats cover anywhere between NM per day. This means that a fast sailboat in ideal conditions can cover more than miles.
However, anything over NM is uncommon. We usually only see cruising speeds that high in races. How fast can a sailboat go under power? Most sailors switch to engine at sailing speeds below 6 knots, especially when on passage. How fast do racing sailboats go? The record is set at They can beat wind speed because they have a planing hull instead of a displacement hull, making them a lot faster than average sailboats.
Can a sailboat sail faster than the wind? Sailboats with a planing hull multihulls can go faster than wind. Displacement hulls the average sailboat can't beat the wind, or just slightly in surfing conditions. Just wondering if you could do a similar article on diesel powered boats.
I have a Seaward 23 powered with two 1. According to what I have read already I should be getting 10 knots cruising speed with a top speed of 12 knots. This is not the case and her bottom is very clean.
Found your article very interesting. Also, this is the maximum hull speed - what you could expect under ideal conditions. Am I missing something?
Thanks for pointing it out, I have updated the article. Just wanted to point out a typo. At hull speed of 5NM you travel NM and miles not the written per 24hrs.
Thank you for your articles. I would love to build and sail a sailboat on which I could live almost anywhere in the world. I currently reside on the Gulf coast of Florida and am surrounded by beautiful warm waters that beckon me to explore them. Hopefully in the followings 5 years I will be sailing into the Caribbean in my self-built traveling home in the water.
I wish to call the oceans home and soon the entire world. I plan to cross the Atlantic from the Caribbean on my first leg around the world. Would you recommend sailing throughout the Mediterranean? Now 56y. I am just really curious how some people have the time and place to design, build, and then sail around. Tell me your secrets�. But WHY is it a maximum speed for displacement boats in quiet waters, responding to this old formula?
It is because the speed increases, the water displaced forms waves.
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