That is the Endeavor, I believe, which I got to see up close when she was in Baltimore years ago. They had some match racing on the Chesapeake, against Shamrock (which Shamrock, I can't recall). The Endeavor's spinnaker covers 1/3 acre. The boom is two feet wide- two people can walk past each other on it and not touch. We were out watching them race on a 53 Hatteras MY which belonged to a friend of mine. The Hatteras is a good-size boat, but it felt like a bathtub toy next to the Endeavor. J-class yachts are amazingly beautiful and fast boats. I am glad I got to see one up close, let alone two. If I had the choice of seeing a J-class race, or the AC- I'd see the J-boats race. Words really fail to describe what it is like to see them; if you love boats, you can't keep the lump out of your throat.