First Atlantic 115 Launches At Heysea Yachts Heysea Yachts was working diligently on their Atlantic 115 model and the first unit in the model has hit the water and is called "Dopamine". The yacht has two-internal decks with a raised pilot house design. The vessel has a wave-piercing bow which should make her a bit more efficient. Top speed is anticipated to be in the 24-knot range thanks to a pair of CAT C32s rated at 1,950 horse power each. Even at 20-knots her range is forecast to be 2,000 nautical miles with 24,000 LT onboard to use.