Originally Posted by mitiempo
The first large (42') fiberglass cruising sailboat was called Arion. Designed in 1950 by Sidney Herreschoff she had both a fin keel and a spade rudder. She is still sailing.
It is not that new an idea and well proven.
Boy, it is pretty tough to compare this to newer fin keel boats. This boat only has an 8 foot beam and its 40 feet long. And 50% of its mass is in its keel. And its hull is more V shaped than flat. The keel is longitudinally long rather than vertically long like a newer fin keel.
Because its so narrow and v-shaped, this will have a lot in common with the full keel boats. The full keel boats owe much of there sea handling capabilities to the hull design, not necessarily to the keel design.
I think the Valiant is probably very similar. Its hull design is more v-shaped than flat. This contributes immensely to its sea handling.
But you are quite right, the fin design and even the flat hulls have been around for centries.