Dear Graham,
Thanks for your positive feedback and question.
The inboard is measured form the collar everywhere in articles and the Rigging Chart.
Valery

Hello. I am pleased to see you have done the calcualtions and trials relating to optimal rigging for different height rowers. I have for a number of years believed that many shorter rowers may have benefitted from more 'scaled down' rigging than the minor adjustments that are usually made. I had a rigger made for my single that allowed a spread down to 152 so that I could play around. Instead of doing the maths and trials as you have done I simply scaled all dimentions down proportionately using a typical average rigging and height for an international oarsman. This led me to a rig that that was too heavily geared at 154 spread, 87 inboard from pin and 275 oar. I was on track with my ideas but off target with the right set up. I am keen to use your figures in my own boat but setting up the juniors I coach will be a different story because the amount of adjustment in the rigging of our club boats will not allow for such changes.
The main reson I am writing is that I want to know in this instance if you have used inboard from the pins or the oar collars?
Well done for the great work you have been doing.

Regards
Graham Watt