Sailing Theory Tutorials - Location of CE CLR and Helm Feel
HowarthSailing
36,019 views
In this video, the idea that a distributed pressure force can be simplified to a single force vector acting on a force centre is introduced. It is also discussed, that two forces separated by a distance will generate a moment or torque, which causes an object to rotate.
The locations of the centres of effort, and lateral resistance are discussed in 3 dimensions on a model sailboat. And an orthographically projected diagram is drawn for the boat.
The fore and aft, as well as the side to side positions of the CE and CLR are related to the conditions of weather, lee, and neutral helm, which are explained by the two forces acting at a distance to create a moment causing the boat to either head up or bear off.
NOTE: It has come to my attention that this video fails to mention the important effect of the shape and area of the boat's hull below the waterline on the amount of Lateral Resistance and the location of the CLR. Please be aware that this is another factor that can play into the position of the CLR.
20 Comments
1. From the 3 figures of boats to illustrate Heel and Helm Feel at about 22:36, the wind direction is blowing right to left, correct?
2. the term "windward" means "towards" the wind and leeward just opposite of windward, right?
3. does "bear off" always mean the boat turning counter-clockwise and "head up" always mean boat turning clockwise?
Thank you.
The underwater profile of the hull changes as the boat heels.
The positioning of the mast and keel :D
Can you help me as soon as we finish the design?
Sailing Theory Tutorials - Location of CE CLR and Helm Feel
HowarthSailing
36,019 views
In this video, the idea that a distributed pressure force can be simplified to a single force vector acting on a force centre is introduced. It is also discussed, that two forces separated by a distance will generate a moment or torque, which causes an object to rotate.
The locations of the centres of effort, and lateral resistance are discussed in 3 dimensions on a model sailboat. And an orthographically projected diagram is drawn for the boat.
The fore and aft, as well as the side to side positions of the CE and CLR are related to the conditions of weather, lee, and neutral helm, which are explained by the two forces acting at a distance to create a moment causing the boat to either head up or bear off.
NOTE: It has come to my attention that this video fails to mention the important effect of the shape and area of the boat's hull below the waterline on the amount of Lateral Resistance and the location of the CLR. Please be aware that this is another factor that can play into the position of the CLR.
I made some changes to my channel this winter that resulted in YT deleting all of my comments/replies on these videos. It's really a shame, because I feel like I have answered quite a few theory questions in the comments section over the years. If you have a question, even if it looks like it's been asked before, please don't hesitate to post a comment, I'll do my best to get back to you.
Cheers,
JH