I'll say that boat banned was the LEGEND, as I remember that story of her shipwrecked on San Miguel Is.
Here's LEGEND, winner 1957 Transpac, designed by Skip Caulkins and owned by the Ullman family. For her success, LEGEND was banned from the Transpac for 1959 and 1961 for being "out of the norm" for the CCA rule that favored wide, beamy boats like FINISTERRE. LEGEND was reinstated for the 1963 race, and the kid Dave Ullman raced on her that year when she won Class B.
LEGEND was built of strip planking in 1951 by Chappie in Costa Mesa, CA and when launched, was the first offshore boat with an aluminum rig in the U.S.
LEGEND met her demise on the return passage from the 1967 Transpac when her skipper and crew of scouts, navigating by DR in thick fog, mistook the red buoy marking Pt. Bennett on San Miguel Island for an identical red buoy 60 miles south marking Begg Rock. The CG admitted their error, but it was too late for LEGEND which drove ashore on wild and reefy Pt. Bennett.
LEGEND's shipwrecked delivery crew hiked 5 miles across desolate and windy San Miguel to Cuyler Harbor where they caught a ride to Santa Barbara on an urchin boat.
3 years later, on a Mexican delivery, Kim Desenberg and I hiked to Pt Bennett and accidentally found LEGEND's remains on the beach. There was the aluminum mast and boom half buried in the sand, pieces of hull, and the sails, including her blue and yellow spinnaker, which were being used as tents and blinds for scientists observing a newly discovered large population of elephant seals.
Here's a nostalgic pic of LEGEND in better times, anchored off Hanalei Pier in 1963, before beginning her delivery home to Newport Beach. Photo compliments of Captain Bob, who wins the Macapuno.
PS: one of the hints in the trivia was when I wrote:
the boat in question, a legend in her time, was long and skinny...
PS2 can anyone identify the big, blue, 61 foot, Sparkman and Stephens sloop in LEGEND's background at Hanalei? She was a fixture on SF Bay, and her name became part of the first two speed winches.