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The 45m Heesen is extremely spacious (just below 500 GT) and is a leader among other yachts in this class. Powered by two MTU 16V 4000 M90 diesel engines, this semi-displacement superyacht has a cruising speed of 20 knots with a top speed of exceeding Heesen's rated maximum speed of 23 knots which is an excellent speed for a 147-foot yacht. At an economical speed of 12 knots with zero speed stabilizers CASTLEFINN has the range of a full displacement yacht (3500 nm). In other words, CASTLEFINN has the best of both worlds, speed and range.