NORTH KINGSTOWN, R.I. — The winged passenger ferry gliding over the surface of Narragansett Bay could be a new method of coastal transportation or a new kind of warship. Its maker, Regent Craft, is betting on both. Twelve quietly buzzing propellers line the 65-foot wingspan of Paladin, a sleek ship with an airplane’s nose. It looks nothing like the sailboats and fishing trawlers it speeds past through New England’s largest estuary.

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