,200-mile trip from Annapolis, Maryland, to Stuart, Florida, was ideal. The twin-engine Corvette 340 cruises ... with the standard Yanmar 315 horsepower engines, she will cruise at 18 knots and top out at more than 20 knots ... for this engine room.  A lot of attention has been paid to noise attenuation, and running this boat for 8 or 9 ...