A band of anxious engineers clambered onto a floating dock in San-Diego Bay recently to watch the newest U.S. Navy flying boat, out for its first water trial; as a photographer snapped away, the plane's bow gaped open like the mouth of a giant whale, revealing an enormous cavern for cargo. The So-ton craft, pictures of which were released last week, was the R3Y-2 "Flying LST," built for beach-assault operations by General Dynamics' Convair division. To pull away from a beach or dock the pilot,simply reverses propellers; the ship needs a run...

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