Not enough last time.Stillraining, Just for myself I must ask, "How much sail do you fly in forty knots?" My early physics says that energy equals mass times velocity squared. That means that the force of the wind at forty is sixteen times as great as the force of the wind at ten knots.
Only 80 maybe 90 square feet of head sail up...no main or mizzen...which made it very nice not having to deal with a boom swinging violently around but not enough drive mid ship to be able to tack...we had to gybe every turn losing to much ground each time in our narrow bay to really make it worth while so we called it quits after a few hours...Running on a deep reach was very very comfortable and might not have been so with anything on the mizzen but it was sure needed to punch upwind me thinks. Those are the kind of things only getting out there and doing it and experimenting in those conditions can teach you..theories are just that..I need to know ..and each boat will be different it that regard also...so you cant just say ...well 20 years ago when we got caught out in our xxxx we did this and it worked...might not work at all in your new yyyy...just MHO
Hope this helps
PS: Eagle Knight flies 1100 square feet of sail I'll let you do the math..