by Bryan R. Swopes of This Day in Aviation
On September 4 1922 First Lieutenant James H. (“Jimmy”) Doolittle, Air Service, United States Army, made the first transcontinental crossing of the United States in a single day when he flew a DH.4B-1-S single-engine biplane, Air Service Serial Number 22-353, from Pablo Beach, Florida, ¹ to Rockwell Field, San Diego, California, a distance of 2,106 miles (3,390 kilometers). He made one refueling stop at Kelly Field, San Antonio, Texas, which lasted 1 hour, 16 minutes. The total duration of the flight was 21 hours, 19 minutes.
Lieutenant Doolittle was awarded the Distinguished Flying Cross for “demonstrating the possibility of moving Air Corps units to any portion of the United States in less than 24 hours.”
The Airco DH.4 was a very successful airplane of World War I, designed by Geoffrey de Havilland. It was built by several manufacturers in Europe and the United States. The DH-4B was a rebuilt DH.4 with fuel capacity increased to 110 gallons (420 liters). The DH-4B was 30 feet, 6 inches (9.296 meters) long with a wingspan of 43 feet, 6 inches (13.259 meters), and height of 10 feet, 4 inches (3.150 meters). The loaded weight of the standard DH-4B was 3,557 pounds (1,613.4 kilograms).
In place of the Rolls-Royce Eagle VII V-12 of the British-built version, Army Air Service DH-4s were powered by a water-cooled, normally-aspirated, 1,649.336-cubic-inch-displacement (27.028 liters) Liberty L-12 single overhead cam (SOHC) 45° V-12 engine with a compression ratio of 5.4:1. The Liberty produced 408 horsepower at 1,800 r.p.m. The L-12 is a right-hand tractor, direct-drive engine. It turned a two-bladed fixed-pitch wooden propeller. The Liberty 12 was 5 feet, 7.375 inches (1.711 meters) long, 2 feet, 3.0 inches (0.686 meters) wide, and 3 feet, 5.5 inches (1.054 meters) high. It weighed 844 pounds (383 kilograms).
The Liberty L12 aircraft engine was designed by Jesse G. Vincent of the Packard Motor Car Company and Elbert J. Hall of the Hall-Scott Motor Company. This engine was produced by Ford Motor Company, as well as the Buick and Cadillac Divisions of General Motors, The Lincoln Motor Company (which was formed by Henry Leland, the former manager of Cadillac, specifically to manufacture these aircraft engines), Marmon Motor Car Company and Packard. Hall-Scott was too small to produce engines in the numbers required.
This same airplane, DH.4B-1-S, A.S. No. 22-353, was flown from the Gulf of Mexico to the Canadian border by Lieutenant H.G. Crocker, 26 May 1923.
During World War II Colonel Doolittle planned and led the famous Halsey-Doolittle Raid against Japan, 18 April 1942, for which he was awarded the Medal of Honor. As a brigadier general, he commanded Twelfth Air Force in North Africa. Promoted to major general, he was given command of the Fifteenth Air Force in the Mediterranean Theater. From 1943 until 1945, Lieutenant General Doolittle commanded Eighth Air Force. He was preparing his command to move against Japan, equipped with Boeing B-29 Superfortress bombers when World War II came to an end.
After the war, Lieutenant General Doolittle was placed on the inactive list. On 4 April 1985, by Act of Congress, James H. Doolittle was promoted to General.
General James Harold Doolittle is the only person to be awarded both the Medal of Honor and the Medal of Freedom. He died on 27 September 1993 at the age of 96 years. He was buried at the Arlington National Cemetery, Arlington, Virginia.
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