You are right. Here is another drawing that shows that. The boobs drawing is wrong by the way.. I never said I was a true mechanical engineer.. It would work only if the person was horizontal.
On the picture the vertical vector is not exactly the weight of the sailor, except if his CG is exactly at the harness hook. Otherwise it´s in proportion of the distance between feet-harness and feet-CG. That is because there is a lever arm effect with respect to the feet.If CG is above harness, the blue force would be higher than weitht (and the difference would be compensated by the feet)
