[Rockter]

Oh Guil.

I am not forgetting fulchrums.

The disturbing moment on the boat is the same for all your diagrams!!!

Show me why the disturbing moment changes. Show me why the restoring moment changes.

The yellow vectors have the same moment arm in all your diagrams. All of them.

How does the red chord alter any of the moments?

You don't draw the forces within the traveller chord. They are balanced within the structure, and don't change anything.

You are getting into the minutae of how the forces are distributed within the structure of the boat, and you are arguing that how you distribute them will right the boat. It does not matter how the forces are distributed from the boom and mast to the boat. The boat heels because of the EXTERNAL forces and associated disturbing moment, NOT HOW THE FORCES ARE DISTRUBUTED WITHIN THE BOAT.

The traveller chord angle will not change anything any more than the amount a car leans in a bend is dependent on your seat belt tension.

If you are right, every racing boat under the sun would have a horizontal traveller chord, anchored to the top of a post level with the boom. You must remember that the traveller chord is an action reaction pair, NO EXTERNAL FORCE ACTS ON THE CHORD, and its angle does not change the relationship between the boat and the wind (constant trim), does not change the centre of buoyancy (so does not change the restoring moment) and its tension does not heel the boat. It cannot, because the forces on it are balanced and there is no external force acting on it.

The wind heels the boat.... an external force with moment.... not the traveller chord.

When your boat is at equilibruim (heeled or vertical), you may say, as Newton does...

sigma{F} = 0 ...forces are balanced (or your boat will have a translational acceleration)

sigma{M} = 0 ...moments are balanced (or your boat will have a rotational acceleration)

Now, lock the boom, weld the boom, hold the boom yourself, however you fix the boom, you will not change those rules, and the traveller tension will not alter that obligation to meet those rules. You heel because of moments there Guil, not traveller angle. The traveller angle does not change the disturbing or the restoring moments.

I look forward to a racing boat design with horizontal traveller chord that helps right the boat. It won't happen.

I have always liked your videos there Guil, and I have watched them all. You have taught me a lot, but you are wrong on this point there Guil. The way that you fix the boom to the boat does not alter the heel angle of the boat.

Rockter.