The bow pitched upward as we passed through a ferry wake at 16 knots on our way from Anacortes, Washington, to Friday Harbor. I subconsciously braced for impact, but it never came. “This is the only boat on the market with a built-in suspension system,” explained Larry Graf, who founded Aspen Power Catamarans in 2008. Cruising through a confused chop of 2 to 3 feet, the Aspen C120 didn’t pound, pitch, or roll. In fact, her ride was eerily smooth and quiet.
The C120’s ride is the result of Aspen’s proa hull design. Though she seems symmetrical to the naked eye, the starboard hull, which houses the single Volvo D6 diesel, is 35 percent larger than the port hull, and the deckhouse is offset slightly to port. It sounds unbalanced,…