I used to sail my 21'Narrasketuck #14 from my home in Massapequa, NY on The Great South Bay of Long Island. Where I sailed, we had a network of 40' wide channels and miles and miles of water 1 - 2 feet deep, which is why the Narrasketuck, with its very long but not too deep centerboard, and long rudder trailing out of a long skeg, was popular. With running backstays, it was like a centerboard version of the Star sailboat. Sailing in the shallow "flats" with an inexperienced crew of four (guests, really) we were engulfed very suddenly in a black-line squall. With no time to drop the sails, I decided to run before the wind, which resulted in the boat rising to a plane - nice at first, but it got out of hand. In about 15 seconds, the wind blew so hard that the boat began to topple head over heals. I lost steerage as the stern and rudder lifted from the water, the sharp bow dug into and through the shallow water, and stuck like an arrow into the soft mud beneath the surface. Sticking up into the air on its bow, the boat flopped over onto its side, casting all into the water. My "crew" started swimming frantically for shore, until I suggested that they try walking first. They did, and after slurping the sails down the horizontal mast and righting the boat, now in a dead calm, we all walked to the beach, with the boat in tow. An exhilerating sailing experience which I never want to repeat !