Nav wrote:
Young America was designed for 6 degrees trim at 10 knots boatspeed and
30 degrees heel. That's about as fast they expected to go when powered
up here.

6 degrees trim on what... the keel trim tab? That sounds like a heck of
a lot.

Bear in mind that at 30 degrees heel, the projected sail area and keel
foil area are only 85% of actual area. Hard to claim that this is when
the boats are most efficient.

Anyway, long narrow boats like the IACC class and the old 12s too tend
to sail at higher angles of heel than more normally proportioned boats.
I still think 30 degrees is a bit of an overstatement.

DSK