DSK wrote:

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.


Who said anything about efficient. Powered up refers to power!

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.

Wot only a 'bit' now is it? Just yesterday you rubbished it! Doug, lots
of boats are only fully powered up at 30 (or more) degrees heel. Of
course as a dingly sailor you wouldn't know that but it's really true.

Let me paint a typical picture for you: At that 30 degrees heel the boat
is alive and really punching through waves to windward. Windspeeed is
probably about 18-20 knots with gusts to 25. The rail is getting wet
with occasional waves over the bow and it's the limit where more wind
means you'll probably have to ease the main sheet (or reduce sails) to
maintain good control and boat speed. It's a fun place to sail -powered up!

Ask any of the others -they've sailed there I'm sure!

Cheers