electrosys
New member
What evidence do you base that assertion on? My understanding is that the Bluebird of Thorne design by Lord Ravenscroft in around 1930 was the first boat with twin keels rather than bilge plates to help a long shallow keel boat to dry out upright. I would be interested to hear of an earlier twin keeler you know of.
How about the beach-launched sailing cobles of the North-East:
"There are two bilge keels, which run two-thirds of the length from the transom forwards, but do not go all the way to the forefoot. These support the hull on the beach and keep the bow vertical."
They certainly had no other keel or dagger-board to prevent leeway, so I guess they could qualify ... and these boats have a history going back several hundred years.