Science: SeaMaster

With bated breath and crossed fingers, the Navy has been watching the flight tests of the Martin XP6M-1 SeaMaster, the world's first multi-jet sea bomber. This week it authorized Glenn L. Martin Co. to say that it considers the SeaMaster "unusually promising." Behind the development of the SeaMaster is a vigorous bid by the Navy to capture an important chunk of the military flying business.

Seaplanes have important advantages: they can take off from water runways that cost nothing and may be as long as necessary. If they stay near some sizable body of water, they have a chance to make...

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