Weight equalisation

the tension (1000N) on the two examples above aren't the same. 

Increasing the height of the hook puts more weight on feet and less on the wire. 

In the diagram above, there is no net horizontal or vertical force and no net moment around the mast base in either case. In a boat the moment is balanced by the sail force / hull couple. In the diagram the moment is resisted by the mast base itself. The difference in tensions in the wires is irrelevant and can be calculated just basic trig and remembering that net forces and moments at any point must be zero if there is no net acceleration at that point.

Edited by KazRob - 03 Jan 22 at 7:32pm

The answer to the question of where to attach wire on the mast, is where it will do minimum distortion to the mast, thereby diminishing detrimental sail shape changes.

Lots of interesting stuff thanks all for contributing.
Now where I was before SWMBO dragged me screaming from the keyboard, was the following conclusion which is:
If my current hook position, is below my CoG, then a clear advantage should be gained by moving it above.
If not then it's obviously back to the platform shoes to push us all further out.

I do still dispute the magic replacement of a rack to the exact same position on a wire simply because I still believe in the weight transferance to mast via the wire is relevant, but at this stage I'm unable to prove why.

One question to Mozzy, re "Increasing the height of the hook puts more weight on feet and less on the wire. " do you think this might be because you guys in 800s are already a way out there on the racks? I'm contemplating flatwiring in the not to distant future and probably earlier than most so need to maximise what little weight and height I have available.
It is however true though, one of the issues we used to have in the early days of kitesurfing in controlling our descent from big jumps if our hooks were too low which they used to have to be in the days before depower in order to maximise pressure on the rails to control the kite, it is wny these days so many waist harnesses with high hooks now feature. Higher hook gives better control in the air if the support comes from above the CoG.with more weight below landings are easier to control.

As to my theory of out board weight from a wire rather than through a rack and the hull I shall have to research harder or build that bloody model to find out for certain.

Edited by iGRF - 03 Jan 22 at 8:05pm

Originally posted by iGRF Lots of interesting stuff thanks all for contributing. Now where I was before SWMBO dragged me screaming from the keyboard, was the following conclusion which is: If my current hook position, is below my CoG, then a clear advantage should be gained by moving it above. If not then it's obviously back to the platform shoes to push us all further out. I do still dispute the magic replacement of a rack to the exact same position on a wire simply because I still believe in the weight transferance to mast via the wire is relevant, but at this stage I'm unable to prove why. One question to Mozzy, re "Increasing the height of the hook puts more weight on feet and less on the wire. " do you think this might be because you guys in 800s are already a way out there on the racks? I'm contemplating flatwiring in the not to distant future and probably earlier than most so need to maximise what little weight and height I have available. It is however true though, one of the issues we used to have in the early days of kitesurfing in controlling our descent from big jumps if our hooks were too low which they used to have to be in the days before depower in order to maximise pressure on the rails to control the kite, it is wny these days so many waist harnesses with high hooks now feature. Higher hook gives better control in the air if the support comes from above the CoG.with more weight below landings are easier to control. As to my theory of out board weight from a wire rather than through a rack and the hull I shall have to research harder or build that bloody model to find out for certain.

Edited by Sam.Spoons - 03 Jan 22 at 9:33pm