Asked this in another thread, but since it's related to Sloop vs. Cutter vs. Ketch this might be a good place to go as well..
For a cutter rig, does the staysail add effectively working sail area upwind? i.e. if you take the staysail out, is the drive of the sails going to be affected? I'm trying to understand how to measure the SA/D of a cutter rig to have some numerical idea of upwind sailing performance. Would you include the staysail?
I know the best thing is to go sail the boat in a variety of conditions, but when buying a used boat I don't expect the sea trial to give me the whole picture, and I understand it's not really supposed to be a test drive anyways.