Originally Posted by L124C
Why, because of the efficiency of lead?
Also, Whats with the swept keel design (the fin retreats radically toward the Stearn)? Haven't noticed it on other boats.
The shark fin style keel, featuring a lot of sweepback, was the common fin keel design for performance oriented boats in the late'60- mid '70s. This design was generally replaced in the late '70s by "higher aspect " keels which feature shorter chords and less sweepback (more vertical edges).
See Good Old Boat - Keel design: What's best? article
You can see this transition by comparing a boat like a C&C mark II to a Mark III. I have a very positive opinion of the older sweepback keels, as while they may have given a little up closehauled, they were far more forgiving if they hit something hard at speed...