Driving the jet is a mid-ship mounted 315 hp Yanmar diesel engine. The hull design was provided by C. Raymond Hunt and Associates, who also design hulls for Boston Whaler, Grady White and others. Each boat is custom-built in Portsmouth, R.I. Hulls, decks and cabins are common across the line, but all other features are added a la carte. The Harrier 25 is labeled a yacht, even though it's only 25 feet long. Hunt says that's because the boat has "yacht-quality finish," unlike what's found on mass-produced boats.