Great story! I knew the varnished 12 meter well from her days moored off Balboa Yacht Club and her winning most every race in S.Cal. at one time or another. She is #18, EASTERNER, designed by C.Raymond Hunt who also designed the Int. 110's, Boston Whaler, and the pretty Concordia yawl.
At the time you towed her, she was named NEWSBOY and owned by Jack Baillee, who hated engines in his fleet of meter boats. EASTERNER participated in the 1958, 1962, and 1964 Defender Trials for the America's Cup, but never did qualify for the Finals. At the time you towed EASTERNER, her displacement was 28 tons! No wonder she carried her momentum a long ways.
Here's a pic of EASTERNER
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Not only did EASTERNER carry a 66 key piano below..but C.Raymond Hunt designed her atop his drafting board, a grand piano in the living room of his old farmhouse in Tilton, New Hampshire. Said Hunt, "A grand piano makes a fine place to work, right height, good shape.."