Navatek II Features Unique Fixed Stabilizer With Split Rudder System

Navatek II is the second twin strut SWATH vessel for which Raymond H. Richards, P.E. has served as the principal naval architect and marine engineer. Joining her larger predecessor, Navatek I, both were designed and built under the banner of Navatek Ships, Ltd., one of the subsidiaries of Pacific Marine, Honolulu.

The 149-passenger, 86-ft. (26.2- m) Navatek II operates out of Lahaina and Maalaea, ports on the island of Maui.

The propulsion package includes twin MTU 12V183 TE02 engines with ZF 255, 3.5:1 reverse/reduction gears. The shafts are Aquamet 17, the wheels are by Bird-Johnson.

Working with hull forms designed and tank-tested by Pacific Marine Engineering Science Co. and Navatek Ships, Mr. Richards developed the hull structure as well as the propulsion and steering system designs for both. He also did the submarine-style (vent and blow), active ballast system in Navatek II.

Both vessels are reportedly approved for full ocean service.

Navatek I is made of a 140- by 54- ft.(43- x 16.5-m) steel carrier vessel with a resiliently mounted, aluminum passenger module, whereas Navatek II is all aluminum. The carrier vessel and superstructure were computer lofted by Specialty Marine of Scappoose, Oregon. Vessel internals and shell plating were plasma cut and formed by Sovereign Yachts of Seattle. One of Navatek ITs unique features is the fixed stabilizer with split rudder system created by Mr. Richards and fabricated and assembled at Tarheel Aluminum in Coos Bay, Ore.

The superstructure was fabricated by Sovereign and transported by barge to Honolulu. For both weight and cosmetic purposes, the thinner panels used in the superstructure were bonded to their stiffeners with adhesives.

The seakeeping characteristics of the twin-strut SWATH are augmented by a ballast system which is computer controlled to automatically compensate for the movement of passengers, as well as such influences to heel and trim as wind.

The sensory and computer system was developed by Lockheed's Marine Group in Sunnyvale, Calif.

Control of active canard fins, by Koopnautic, is also integrated through the onboard computer.

Other stories from September 1994 issue


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