Ran across this article in my Sailing World... Really enjoyed it and found it online...
Design in the Volvo Ocean Race: Playing With Power | Sailing World
I thought there were some pretty interesting points about the design changes from the 70's...
1. Making the canting pin axis 5 degrees from horizontal to give
lift from the
keel
2. Eliminating the overlapping headsail, but keeping the VO70 rig J
3. Symmetrical
dagger boards...
Pretty cool stuff!