Good quote
From one of the best (perhaps the best) sailor on the Potomac River in his after action description of our Frostbite Regatta last year (driving rain and 15-25knots of wind):
"Our choice for our #1 (155%) was driven by the conditions. In order to
carry that sail, we luffed the forward 60% of the mainsail the entire
time, often all the way. Our main trim dictates speed upwind, mainly
through control of heel angle and rudder drag. My wheel is marked with
tape bands that the main trimmer uses to play the traveller-ie;once he
sees the helm approaching 20-30 degrees of rudder angle (weather helm),
he will automatically drop the traveler down until I can get the rudder
centered again. This adds well over a knot and a half to our upwind
speed, as dragging the rudder sideways through thick water is much
slower than luffing a sail through thin air. We try to keep the boat's
heel angle below 19 degrees; anything more and we reef the main and get
out a smaller headsail. It feels slower, but the math doesn't lie.
As for down wind, that's all about projected area, so a 155 is probably
the way to go. Once we get the chute up and stable, we also ease the
outhaul and main halyard, the backstay, as well as the boom vang a
touch. (the trick is to remember to put it all back before you round to
go upwind) We also rig a preventer on the boom to stop accidental jibes,
if we are close to dead down wind."
I strongly suggest marking your rudder angle and trimming the main to
it. It feels strange at first, but has really proven a winner for us.