Looking like some giant fledgling bird of the sea that had not yet grown its wings, the hull of a big Boeing Clipper emerged from the plant at Seattle recently. The wings of this forty-two-ton flying boat are so broad it could not be assembled under the roof, and the unfinished craft was rolled to the launching dock to await its tail surfaces, wings, engines and hydrostabilizers. This was the first of six clippers ordered by Pan American Airways and scheduled to take off soon from the waters of Puget Sound. Three of the six are to be resold by Pan American to Great Britain. Identical in size and general design with the Clippers already in transatlantic and transpacific service, the new flying boats will have four 1600-horse power engines instead of the 1,500-horse power units of the earlier planes. Larger propellers will be installed, fuel capacity is increased by 1,200 gallons to a total of 5,400 gallons, and cruising range is stepped up to more than 4,000 miles.