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Lifting Body Ships - "Hybrid deep-vee (HDV)"
In addition to the Navy's multi-hull Sea Flyer demonstrator Navatek had built a second large-scale, lifting body technology demonstrator craft, the HDV® 100. Instead of a catamaran parent hull, the 100-foot, 100-ton, 50-knot HDV (Hybrid deep-vee) 100 employs an anti-slamming, deep-vee monohull as the parent hull, mated to a Navatek “blended-wing” underwater lifting body. The addition
of a Navatek underwater lifting body, with a forward foil for heave
and pitch control, significantly improves the performance of the
deep-vee monohull. At zero/loiter speed, the added mass of the lifting
body dampens motions, making the monohull more stable, allowing
for safer, easier deployment and retrieval of autonomous unmanned
vehicles, equipment packages and personnel. At high speeds, the
lifting body provides enough lift to elevate the hull clear of the
water and eliminate hull drag. The lifting body lift-to-drag ratio
is higher than that of the hull and, as a result, far less power
is required to achieve speeds in excess of 40 knots. The underwater
lifting Launched in 2004, the HDV-100 initially operated without a lifting body allowing Navatek to conduct additional research on large deep-vee hullforms . The lifting body was installed in Fall 2005 and sea trials were conducted in 2006.. |
body also offers a third benefit. The additional displacement from
the underwater lifting body can increase the monohull’s payload
by 15-20%, allowing it to carry more supplies, equipment, personnel,
or fuel to increase its range of operations.