Carl,
It's late here so I'll be brief,
1, The calculation does take the aspect ratio of the kite into consideration.
Calculation linky (EXCEL) measureemnt method (see D.9 Maximum Authorised Spinnaker area)
2, For wind speeds, I assume the OOD / Race officer declares if the race is a "light" or "heavy" race - does this ever get protested in the states ?
3, Agree "sail area / weight" gets hit hard in both systems.
Night all
