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August 21, 2000

All American Marine Teams with Teknicraft Design

Aluminum boat builder All American Marine, of Bellingham Washington, has signed a contract with Auckland, New Zealand’s naval architect Nic de Waal for the exclusive building rights to his unique Teknicraft catamaran designs on the U.S. west coast. Each of the twin Teknicraft hulls or sponsons employs a combination of symmetrical and asymmetrical shapes. The symmetrical bow-sections ensure directional stability in short swell conditions and following seas, while the asymmetrical amidships and aft sections ensures softness of ride and reduced wetted area which enhances comfort and economy. Horizontal steps on the inside of the tunnel walls act both as chines to deflect green water from the hull surface, and to break up the solid water into spray.

The vertical inside shape of the sponsons, reduces the planing area, thereby reducing the vertical acceleration forces. An additional feature in enhancing passenger and crew comfort is the action of the longitudinal chines on the inside of the tunnel walls. As solid green water is broken up into spray while being deflected from the hull, it mixes with air steaming down the opening between the sponsons. This mixture of spray and air creates a high-density medium inside the tunnel, which causes a dampening effect each time the hull moves through a trough of a wave.

The action of the longitudinal chines inside the tunnel, as well as wide chines on the outside, both deflecting water away from the hull, reduces the wetted area and therefore the resistance of the hull. The vertical inside shape of the sponsons minimized wave interference between the sponsons, which further reduces drag.

On a 65x24-foot model currently building at All American Marine, a hydrofoil system is fitted to the hull. The lift produced by the foil-system reduces the hull resistance, which increases speed; while at the same time increases the load-bearing capability. The foil action reduces the power needed to maintain service speed. Unlike conventional hydrofoils, which lift the hull completely out of the water, these foils are designed to only partly reduce the draft, thereby reducing resistance, but still maintaining good seakeeping by having the hull still partly submerged.

Scheduled for an end of December delivery, the 65-footer for Channel Island Cruises, L.L.C. of Ventura California will carry 149 passengers at 24 knots. The boat will be powered by a pair of Cummins KTA19 M4 engines each delivering 700 HP @ 2100 RPM into Twin Disc MG 5114A SC marine gears with 2.5:1 ratios and turning 36x42-inch propellers on three-inch Aquamet shafts.

Hull plating will be 1/4-inch 5083 aluminum below the water line with 3/16 and 5/32 above. All metal will be cut in Seattle at Northwest Plasma.

For additional drawings and information on the Teknicraft contact:

Nic de Waal
Teknicraft Design Ltd.
P.O. Box 34-712, Birkenhead, Aukland, NZ
phone: 011 649 480 1104 fax: 011 649 480 1304
e-mail: teknicraft@xtra.co.nz

or:

Matt Mullett
All American Marine, Bellingham, WA
Phone: 360 647-7602 Fax: 360 647-7607
e-mail: matt@allamericanmarine.com

For more on the vessel’s assignment:

Alex Brodie
Channel Island Cruises
L.L.C. 1867 Spinnaker Dr. Ventura, CA 93001
phone: 805 642-1393

For more on the Cummins engines:

John Walls
Cummins Northwest, Inc.
811 S.W. Grady Way, Renton, WA 98057_9811
phone: 1 800 274_0336
e-mail: jmwalls@cnw.cummins.com

500-476, 475-451, 450-426, 425-401, 400-376
375-351, 350-326, 325-301, 300-276, 275-251, 250-226, 225-201
200-176, 175-151, 150-126, 125-101, 100-76, 75-51, 50-26, 25-0