Since yachts first raced, getting a favorable rating for your race-boat has been an indulgence, verging on obsession, for many owners, designers, and crew. Using the Volvo Open 70 as an example, we talked with Philippe Oulhen of the Juan-K Design office. The VO 70 was used for three Volvo Round the World Races from 2005 to 2012. Juan Kouyoumdjian designed the three winners in a row, ABN Amro 1, skippered by Mike Sanderson, won the 2005-2006 edition, then Ericsson 4 in 2007-2008 with Torben...