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Vol. XVII No. 7 ……. Cover: THE LARGEST FLYING BOAT – LARGEST PROPELLERS … Built for the U. S. Navy, the 70-ton Martin Mars – largest flying boat in the world and capable of carrying 150 fully armed soldiers – made its first flight test on July 3, carrying a cachet of 14,000 air mail letters. Appropriately enough, this giant of the air uses the world’s largest propellers – Hamilton Standard Hydromatics – which measure 17 feet 6 inches in diameter. ….. Articles: All U.A.C. Divisions Unite in Effort To Reclaim Vital War Materials ….. TACA’s Flying “Tramp” Ships Render Important War Service ….. News Flashes ….. News of the Month ….. Tale Spins ….. Ground Broken for Kansas City Plant; Production Begins at Buckland ….. We Re-Discover America (Insert) ….. Interchangeability Confirmed By Unique Test ….. Propeller Commemorates History – Making Combat ….. Harry M. Arnold Appointed Assistant Service Manager ….. East Hartford Notes ….. Guests at Hamilton Standard ….. “Corsair” Fighter Put Through Paces At War Production Drive Rally ….. John J. Hospers Appointed Sales and Service Manager ….. Interest Runs High In Slogan Contest ….. Sikorsky Discusses Helicopter’s Future ….. Grumman Martlets Active In middle East Combat ….. Airport Visitors