Many thanks for Mark Powers and Allen Carpenter for the interesting document “Sailing a Nonsuch Cat Boat.”
As one who has played around with the topping lift as a sail shape control, I was intrigued by the following advice:
Topping Lift:
- The topping lift is the true secret of Nonsuch sailing. In light winds setting up the topping lift properly is necessary to keep the weight of the wishbone boom from dragging the leech down and “closed”. In a breeze there is enough wind in the sail to do this automatically. Therefore in light air, there should be some tension on the topping lift for all points of sail except for going to windward. It is critical for optimal light air sailing to adjust the topping lift so that the leech is “open” and “fair” as indicated by the speed stripes on the sail. When going to windward there should be no tension on the topping lift whatsoever.
Why not use the topping lift to induce twist in light air when close hauled? In light air the angle of apparent wind is much different at the masthead compared to deck level. That’s when we want twist.
I always try to get the most speed I can from my boat, but I know many of you are far, far better than I am and I’d love to hear your thoughts on this matter.
In addition, in heavier air (close to needing a reef, but not quite), I’ve used the topping lift to induce twist and depower the top of the sail. I know our bendy masts do this to some extent, but it seems the topping lift helps too. What’s been your experience?
I don’t formally race, but if there is a sloop traveling in my direction I do my best to show 'em my wake.
Thanks for your tips.
Jim Cosgrove
FATE 30U #343
Galesville, MD