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Transport CROWLEY People Who Know Crowley Maritime Corporation, 2 CROWLEY is registered trademark of Crowley Maritime Corporation Circle 2 on Reader Service Card SNAME Annual: Ship Design & Testing Sideways to Swimmers: Unusual Tank Testing Offshore supply vessels, passenger vessels, yachts. How much power is required and how will they ride in seas? These are the questions Gerry Stensgaard, .Eng, and the staff at the Ocean Engineering Centre (OEC) of Vizon Scitec (formerly BC Research) usually answer. But over the years naval architects and others have asked for answers to some unusual questions. "They are open minded about special testing," says Tim Nolan. .., Naval Architect at Tim Nolan Marine Design, PC. Special testing might mean peculiar test of typical craft. Or it might be basic resistance and seakeeping tests for an unusual craft; which might seem easy, but the test setup can become diffi- cult. "We are solution oriented," says Stensgaard, "If someone has problem, we try and come up with setup that will give the answers." Located in Vancouver, Canada, the OEC consists of 2 by 1 ft. wide towing tank, whose carriage has maxi- mum speed of 1.7 ft./sec. Though most of the testing takes place in this tank, there is also an 8,7 sq. ft. wave basin with wavemakers. It is one of the few commercial towing tanks in North America. good example of unusual testing was for the new 5 2 ft. cable ferries replacing the 5 1 ft. ones already operating on the Missouri River in three locations near Great Falls, Montana. Each ferry is attached to two cables across the river. One is the overhead trolley cable, which keeps the ferry from being carried downstream, and the other is the power cable, which pulls the ferry across the river. As