Today a big chance I have killed my darling
Sven Yrvind
At 86, Sven Yrvind is still pushing the limits of small-boat design. Discover the philosophy and technical grit behind his 'Exlex' series.
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Today a big change.
I have killed my darling.
The mizzen is gone.
Exlex will not be a canoe yawl.
Exlex the sailing canoe is her new name.
Why?
I did some estimates on lead in this case I use the word in a geometrical sense. That is how far the center of effort is in front of the center of lateral resistance.
It turned out that she will have far to much weather helm.
My last three boats have had lee helm.
Now this one I did everything to get weather helm.
I overdid it quite a bit.
There is no way to from first principles calculate this property. It is all done by rule of thumb.
The existing rules of thumb do not apply to my boat as she is to different.
Luckily my friend Rolf Elisson ( who have written Principles of Yacht Design) and I designed several small ocean going cruisers in the 1990-s
They all turned out with an excellent balance.
Today I spoke to him again and that cleared up things.
My design use the rudder as part of the lateral area. To understand it it helps to think of it as a secound centerboard wich force can be adjusted by rudder angle.
Likewise the bow centerboards force can be adjusted by rising and lower it.
Combining the two gives good control. Lee helm or weather helm can be chosen as desired.
This helps a lot with sailing without selfsteering or autopilot.
For more see Yrvind.com
There you can also support my project by donations via Pay pal and Swish 0706 200 550
Latest Episodes from Sven Yrvind
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One Daggerboard, Two Bilgeboards and One Rudder.
This Youtube channel is about me Sven Yrvind. I am87 year and 5 months old dyslectic solo sailor. I am building a high-latitude cruiser. She is 5.6 meter 18 feet 4 inches long. Her beam is 1.45 meter. She is a three masted lugger with a total sail area of 9 square meter. She has a bow centerboard...
Starting the Interior – 1/5 Scale Model.
This Youtube channel is about me Sven Yrvind. I am87 year and 5 months old dyslectic solo sailor. I am building a high-latitude cruiser. She is 5.6 meter 18 feet 4 inches long. Her beam is 1.45 meter. She is a three masted lugger with a total sail area of 9 square meter. She has a bow centerboard...
Why I Added 40 cm.
This Youtube channel is about me Sven Yrvind. I am87 year and 5 months old dyslectic solo sailor. I am building a high-latitude cruiser. She is 5.6 meter 18 feet 4 inches long. Her beam is 1.45 meter. She is a three masted lugger with a total sail area of 9 square meter. She has a bow centerboard...
Shaping the 1/5 Scale Model.
This Youtube channel is about me Sven Yrvind. I am87 year and 5 months old dyslectic solo sailor. I am building a high-latitude cruiser. She is 5.6 meter 18 feet 4 inches long. Her beam is 1.45 meter. She is a three masted lugger with a total sail area of 9 square meter. She has a bow centerboard...
The Model Is Planked – It Was Easy.
This Youtube channel is about me Sven Yrvind. I am87 year and 5 months old dyslectic solo sailor. I am building a high-latitude cruiser. She is 5.2 meter 17 feet long. Her beam is 1.45 meter. She is a three masted lugger with a total sail area of 9 square meter. She has a bow centerboard. I am p...