Carbon vs Aluminium
This my interpretation of this mysteryThe new Volvo ocean racer are 70 feet long with a mast more than 100 feet tall. The boat weight about 13 tons (less than a swan 46) and the bulb around 5 tons, 14 feet below the waterline. During this race, the boats are expected to cover up to 600 miles per day, this is 25 knots average per hour. In a race boat, weight at the masthead is the enemy. Under sail, the mast acts as a long lever arm. Add 1 pound near the masthead and you need to add about 10 pounds of ballast to the keel to counterbalance it. That's 11 extra pounds you're carrying around the world. Carbon fiber cost two to four times as much as their aluminum equivalents. It is irrelevant when you are sponsored and the objective is to win a race around the world and get visibility for you sponsor. These boats are the formula 1 of the sea and they use the most up to date technology even if sometimes it is calculated to the extreme. Prior to rigging, the carbon spar will be half the weight of its aluminum counterpart; fully rigged with conventional shrouds, the advantage is reduced to about 35 percent. But still on a 100 foot tall mast, this is several hundred pounds they save at the top. I agree with your comments Rob that designers should be a little on the safe side and make the mast section a bit larger, but again these million dollar boats are extreme boats and everything, specifically weight aloft is not welcome.I think that contrary to Franklin affirmation, most carbon mast have a regular rigging with few exceptions like in Freedom. Aluminum masts are the same with the Hunter vision series or like the Non Such.Everyone can follow the race at www.volvooceanrace.org