DSK wrote:

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.




Nav wrote:
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.


OK, I am still not sure what you mean by "powered up." It sounds to me
like you are relishing the feeling of heeling too much. It's fun, but
it's really not fast.

.... Of course as a dingly sailor you wouldn't know that but it's
really true.


Spoken like one whose experience in racing class dinghies is limited to
embarassing capsizes within 100 yards of the club dock.


Let me paint a typical picture for you: At that 30 degrees heel the
boat is alive and really punching through waves to windward.


At 30 degrees heel, the boat is heeling too much. It is "punching"
through waves because the hull presenting a set of awkward angles. Other
boats have depowered a little and are going faster.

Have you done any big boat sailing or been in a race in windy
conditions? Why not read the book whose URL I posted and then come back
on it. Better yet go back to the classic literature and look at the
tests of the Gimcrack. She was fastest at 30 degrees and was no faster
at 35 degrees. That's still a correct rule of thumb for most fast
cruiser racers today.

Perhaps Donal would like to post the figs. for his boat -if he's got them?

Another slam dunk.

Cheers