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So later Warner-LeBlond and Velie engines were used in those planes. Later called the “Chic”, various models of this plane were produced 
The Aerial Service Corporation was re-organized in 1929 when Chicago financial interests entered the firm, headed by well-known Major R. W. Schroeder. The name was changed to Mercury Aircraft, Incorporated, and the Schroeder-Wentworth Safety Plane was built as an entry in the 1929 Guggenheim Safety Contest. 
During 1928-1929 Mummert designed a special low-wing racing monoplane known as the Model S. It had a retractable landing gear and was powered by a 90 hp.l 4-cylinder inverted Cirrus engine. This plane was built by Otto Kohl who in later years founded the well known Curtiss Memorial Museum at Hammondsport.
During the depression in 1931 the Chicago financial interests withdrew from the firm and Joseph Meade took over as President and General Manager, with Harvey Mummert as Vice-President and Chief Engineer. The aircraft business was at a very low ebb so it was decided to build another racing plane to keep their staff employed. Known as the S-1, it was another low-wing monoplane, powered by a 4-cylinder supercharged inverted Cirrus engine. Both this S and S-1 racing plane were flown by Mummert in the National Air Races of that period. The firm struggled through the depression on years making a few planes, parts for lighter-than-air craft and a new ski landing gear for winter flying.
Following a short illness Mummert passed away on May 5th, 1939, at bath Memorial Hospital, Bath, New York, at age 47. He was survived by his wife, a daughter and two sons. Burial was in pleasant Valley Cemetery at Hammondsport. 
Flying pioneer Harvey C. Mummert was skilled aircraft engineer, pilot and plane builder, and the designer of many very successful planes of verging types and sizes. Well-known throughout the United States for his active participation in Air Tours and Air Face Events he always made a good showing.  
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