BoatBanter.com - View Single Post - In-Mast Furling

(Bobsprit) wrote:
For a cruising boat 35-40 feet, how much performance is lost with an in-mast
mainsail furling system. What are the specific losses.

Frank and Ronnie Maier wrote:
Well, hell; since no one is replying seriously

Well, look who's asking.

Citing specific loss requires a specific situation. Generally
speaking, you'll lose *some* efficiency; this is why some designers
have tried wrap-around sails in the past. Ya want a number? I'll say
that you'll be a full knot slower upwind than the same boat without
in-mast furling.

I think that comparing PHRF numbers of boats of the same type with in-mast furling
shows a big loss, like over a minute per mile... and this includes downwind
performance, which will be least affected.

Frank (I've come to accept roller furling headsails but still can't
stomach in-mast furling)

I can stomach it, I just don't see any reason why anybody who isn't planning on
spending a great percentage of their sailing time in very high wind areas would
want it.

Fresh Breezes- Doug King