Many men, from Dr. Rudolf Diesel to Walter Lees and Frederic Brossy, have had direct or indirect hands in the making of this record. The greatest of all contributions was that of Lionel M. Woolson, who created the engine and flew with it in every test and brought it through its early troubles to the point of readiness for the commercial market. The flight that lasted four days and three nights is his memorial, quite as much as is the bronze plaque unveiled last April in the Detroit show hangar. [Illustration: Figure 6.--Stinson SM-1DX "Detroiter." This airplane, powered with original Packard DR-980 diesel engine, made the world's first diesel-powered flight on September 19, 1928. (Photo courtesy of Henry Ford Museum, Dearborn, Michigan.)] [Illustration: Figure 7.--Packard-Bellanca "Pacemaker." This airplane, powered by a Packard DR-980 diesel, holds the world's record for nonrefueling, heavier-than-air aircraft duration flight. The flight lasted 84 hours, 33 minutes, 1-1/4 seconds, and was completed on May 28, 1931, Jacksonville, Florida. (Smithsonian photo A48446B.)] [Illustration: Figure 8.--Verville "Air Coach," October 1930. (Smithsonian photo A48844.)] [Illustration: Figure 9.--Packard-Bellanca "Pacemaker" owned by Transamerican Airlines Corporation and used by Parker D. Cramer, pilot, and Oliver L. Paquette, radio operator, in their flight from Detroit, Michigan, to Lerwick, Shetland Islands, summer 1931. (Smithsonian photo A200.)] [Illustration: Figure 10.--Ford 11-AT-1 Trimotor, 1930, with 3 Packard 225-hp DR-980 diesel engines. Note special bracing for the outboard nacelles. (Smithsonian photo A48311B.)] [Illustration: Figure 11.--Towle TA-3 Flying Boat, 1930, with 2 Packard 225-hp DR-980 diesel engines. (Smithsonian photo A48319.)] [Illustration: Figure 12.--Stewart M-2 Monoplane, 1930, with 2 Packard 225-hp DR-980 diesel engines. (Smithsonian photo A48319C.)] [Illustration: Figure 13.--Consolidated XPT-8A, 1930. This is a Consolidated PT-3A powered by a DR-980 Packard diesel. (Smithsonian photo A48319E.)] The Robert J. Collier Trophy, America's highest aviation award, was won by the Packard Motor Car Company in 1931 for its development of the diesel engine. The formal presentation was made at the White House, March 31, 1932, by President Hoover on behalf of the National Aeronautic Association. Alvan Macauley, president of the Packard Motor Car Company, accepted the trophy, saying: "We do not claim, Mr. President, that we have reached the final development even though our diesel aircraft engine is an accomplished fact and we have the pioneer's joy of knowing that we have successfully accomplished what had not been done before...."[8] The amazing early success of the Packard diesel is illustrated by the following chronological summary: 1927--License agreement signed between Alvan Macauley and Hermann I. A. Dorner to permit designing of the engine.