Starting to get somewhat off topic.... But I'm afraid this is out of date. I can't think of a cruiser racer, or dedicated race boat, launched since 2004 with an overlapping headsail. IRC really hates them. On the Elan we're in the process of getting rid of them, as we think the rating hit is just not worth it, especially as the design of smaller jibs has improved so drastically as to be able to get a lot of power out of them, especially with a barber-hauler. In fact we think we will have the same speed as before in over 10 knots, certainly in over 12, and easily good enough to sail to a rating 15 points lower in over 8. And since racing generally doesn't start until there's a reliable 6 knots that leaves a 2 knot hole where we might still wish for a big genoa. And we were never really competitive under 10 knots anyway....
Originally Posted by lw395
The equation might start to turn back in favour of the big headsails on a masthead rig, I don't have much experience with them under IRC, but certainly with a fractional rig the Genoa is rapidly becoming history.
You never know, I might be right!