Navy's new 'mystery' plane. Washington, D.C., Dec. 18. The U.S. Navy's giant amphibian patrol ship which has arrived in the Capital from Florida. The huge plane was built secretly by the Consolidated Aircraft Corporation at San Diego, Calif. Of the high-wing type, the amphibian has a spread of 104 feet and is 65 feet long. Its amphibian floats fold into the wings. Twin wasp engines, built into the wing, provide the power