SEAKINDLY The Sea Blade hulls stable and efficient components form together to create the hull's Ultra Deep-V technology, providing a seakindly hull form that has been proven to decrease peak slamming forces by up to 40% compared to a Deep-V.
The center hull design is the key to the Sea Blade ride quality and comfort. Similar to a traditional Deep-V, the Ultra Deep-V has a V shaped cross section, however the Sea Blade hull achieves this by combining longitudinal steps with 0° deadrise with Ultra High Deadrise hull panels with ≥ 50° deadrise. Hydrodynamic science has long understood the benefits of Ultra High Deadrise but the Sea Blade is the first hull form to apply it successfully. DESIGN BENEFITS: Better seakeeping and seakindliness for greater ride comfort. Safer, softer landings than a deep-v hull. Safer, softer landings especially when the boat is heeled. Hull roll is not too stiff like a catamaran, nor too soft like a deep-v, providing better ride quality.
VALIDATION TESTING - 40% LOWER PEAK SLAMMING FORCES Planing hulls generate lift with forward speed. This lift reduces hull immersion and a boat can readily become partially or fully airborne when launched off waves and can uncomfortably and dangerously slam during reentry landings. The unique Sea Blade hull has been designed to reduce slamming forces as proven by computer modeling, laboratory experiments and sea trial testing. Note: Testing and Validation Completed at the University of Southampton.
HEELED LANDINGS In a seaway, planing hulls experience complex motions from wave excitation. Therefore, when a boat is launched off a wave it’s rarely level. Additionally, in waves, a boat rarely lands on flat water, further affecting its effective heel. The diagram to the right shows that a Deep-V hull is a 25° wedge and when heeled 10° on landing, its effective deadrise is reduced to only 15°. In contrast, an upright Sea Blade has 40° wedge sides so that when landing heeled 10°, its effective deadrise is 30° . This is TWICE the effective deadrise of the heeled Deep-V hull. This unique Sea Blade attribute provides a margin of comfort and safety when running in waves and especially in rough seas.
WEDGE WATER ENTRY PRESSURES AS A FUNCTION OF DEADRISE ANGLE The hydrodynamic graph to the right plots the pressures of a wedge water entry. It shows that until deadrise exceeds 40°, peak plunging pressures exceed initial entry impact pressures. In fact the peak plunging pressures of a 40° deadrise wedge are over 60% LESS than a 25° wedge. This provides further proof why Sea Blade sides with over 40° wedge angles significantly reduces peak slamming pressures.
COMPUTATIONAL FLUID DYNAMIC (CFD) MODELLING OF SEA BLADE VS. DEEP-V IMPACT EVENT The graph to the right compares the results of a computer simulated impact event of the reentry landings of different shaped hulls (but identical in length and weight) falling from 3 feet with a forward velocity of 35 knots. The (RED) plot shows the results of a typical 20° Deep-V hull where the vertical acceleration rises quickly to a high and long peak. The Deep-V hull impact is like stopping a car by slamming on the brakes causing passengers without seat belts to fly through the windshield. The (BLUE) plot shows the results of a Sea Blade hull with three distinct vertical acceleration peaks. The first occurs when the pad keel hits the water and immediately slows the impact and the second and third occur when the longitudinal steps hit the water and progressively slow the hull. The Sea Blade impact is like stopping a car by pumping on the brakes causing the car to slow more gracefully without violently tossing the passengers.
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