I have not calculated the difference, but..

Consider that the lower hull is the fulcrum you are going to turn the boat over on. By moving the righting line over the hull vs. from the mainbeam you get a real advantage. 50cm is a lot when considering the leverages that is applied.

I think Wouter posted some calculations a long time ago on the min weight needed to right a boat.


I had no issues righting a Tornado solo as long as the wind was sucking (ref Buckminster Fuller). Two up we could right the T without a righting line. Just yanked it up by grabbing the dolphin striker. My partner weighted in at 85kg and myself at 100kg..