Above is an excellent review of the 421 Catamaran from Multihull World. It explains how the Lagoon 421 corrected the problems of the Lagoon 420 that was designed to motor sail rather than sail. To quote the opening paragraph of the article….

“Here is the revised and corrected version of the 420. With its less bulky lines and more hydro-dynamically efficient hulls, the 421 should make a name for itself as one of the most widely-distributed catamarans on the market.“