San Francisco America’s Cup

Few Americans participated in the Cup

 

planing TasarThe New Zealand, Australia and Switzerland crew members are valued because they are trained in more modes of sailing than Americans. Some may still disagree but after this cup most recognize the importance of crew competency over sailboat designe even if they do not yet realize the incompetency of the US trained.

I blame the sailing schools and advocate that those schools start teaching ocean sailing using higher- performance designs. The problem with the boats currently being used, such as keelboats, is that “at some critical wind speed their headsails fall centrally by gravity.” At that point the vessel stops. Crew weight isn’t enough to prevent this on traditional racing monohulls.

On a monohull like a MacGregor, however, “crew move their weight forward over the progressively narrower forward underbody, the hull stability decreasing to the point where it will become neutral.” A 15 percent heel can then be established by moving to the side and the headsail can remain in position to capture any wind in the near calms.

This bow down and heeled attitude is an importat mode of sailing and higher speeds in very light airs occur when the handling is done that way. Roger MacGregor states in the next to last sentence of his how to sail the X literature (see)

How To Sail The X by Roger MacGregor

“In light wind, keep the crew forward and positioned so the transom is almost out of the water and the boat heels about 5 to 10 degrees. This heeling reduces the amount of hull surface in contact with the water. In light wind, the surface area touching the water creates most of the drag. The more surface in contact with the water, the slower the boat will go. A 10 degree angle of heel reduces this area significantly.” On a Mac26x 11, degrees is enough to bring the centerboard slot out of the water. Significant indead.

Bethwaite, pg 270 adds “if at the same time, the crew separate their weights in the sideways sense, this will stabilize the boat in a roll (technically, by separating their weights they increase the angular inertial)” Hence even in light wind with waves, higher-performance designs can match those of more rounded design – like the Classics (M included in that group). “The more the crew can stabilize the hull and steady the rig in light air, the more efficient and powerful can the airflow over the sails become, and the faster the boat will sail.” In addition when heeled and trimmed bow down the shape presented to the water is River dinghy (M) or single catamaran hull like.

 

Tasars line up
 

42 thoughts on “San Francisco America’s Cup

  1. Global Vision for America’s Cup

    “It should be more like Formula One, where you have races all around the world and all the races count toward the Championship.” Larry Ellison in 10 March 2014 San Francisco Chronicle.

    regattas all over the world, Louis Vuitton Cup then America’s Cup in Honolulu is the current Vision. AC45s followed by AC60s but no AC72s as those are overly expensive.An Atlantic Division and a Pacific Division with division championships in Port of Rome and Shanghai.

    “Sports that don’t make money are just hobbies for rich guys.”

  2. Incidents in the 1880s involving American center boarders were used to discourage there use in America’s Cup races. “Cutter cranks” claimed that capsizing was not possible with the deep draft British “keel” boats and that view prevails more or less even today.

    SV Murrelet side view
    Murrelet is a center boarder though this is not readily apparent. A centerboard is daggerboard that cuts down the middle of the vessel. Our cruiser avoids cutting accommodations down the middle through a power boat like raised navigation area. The rudders serve as leeboards, another kind of daggerboard, meaning that they, like the centerboard, also hold the vessel from being pushed with the wind. For the most part Murrelet “goes where she looks” but I notice some drift, like a plane in a cross wind. The three daggerboard foils are effective in winds of 17 knots for upwind pointing and on other points of sail in much higher winds (bufourt 7)

    When Murrelet is close hauled, excessive leeway is usually the result of an overpowered main. Experienced keelboat sailors have a hard time with this and insist on telling us to pull the boom in as close to the centerline as possible to race into the wind, as would be done on a keelboat. But what this does on a centerboarder is put power in the main sail and that power is one that is lateral. Easing the main puts the power back in the genoa where the power is more to the windward. In winds over 17 MPH having both rudders in the water reduces leeway.

Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.