THIS GO- ANYWHERE TRAWLER HAS SUPERB DETAILING IN INTERIOR AND EXTERIOR FINISHING , GENUINELY HAS TO BE SEEN TO BE APPRECIATED !Classification: RINA : 100 -A-1.1
The ATLANTIC 66 was not designed as a near shore cruiser that could run at 15 knots when needed.
She has a full displacement hull designed for only one thing, 9 knot displacement speeds at
maximum comfort and range in blue water situations.
Serious blue water yachtsmen consider (Voyaging Under Power) by Captain Robert Beebe their cruising bible. In his book three of the main calculations for the ideal cruising yacht are
D/L Ratio is the ratio of the displacement of the vessel to its length. Beebe recommends a ratio of at least 270 for a 50’ Ocean capable vessel. The ATR 66 has a ratio of 398.
A/B Ratio measures the ratio of the side view of the vessel above the waterline to the side view area below the waterline. Beebe recommends a ratio of 2.6 or below. The ATR 66 has a ratio of 2.05.
Anyone who spends much time around large ships has noticed the bulb shaped protrusions that are common on bows of large ships. To understand the purpose of the bulbous bow, we have to briefly review the characteristics of a displacement hull as it moves through the water.
Displacement hulls push water aside as they move. The water that is pushed aside forms a wave that begins near the bow. The length of this wave is proportional to the speed of the hull through the water the faster the hull moves, the longer the bow wave. At some speed, the length of the bow wave increases to the point that it matches the length of the hull, and the hull operates in the trough of the wave, with a peak near the bow and another peak near the stern. This speed is called the hull speed and it is approximately 1.34 times the square root of the waterline length of the hull.
The purpose of the bulbous bow is to change the nature of this bow wave to reduce the drag it
induces on the hull. The bulbous bow creates its own wave that is farther forward and out of phase with the natural bow wave created by the hull, effectively subtracting the normal bow wave add reducing its drag-inducing effect.
Clearly the design of the Atlantic 66 conforms or exceeds to Beebe’s ideal offshore design for vessels.
She is retro above the waterline but pretty modern below the waterline!