Table 20 shows the status of American production of service planes by quarterly periods.

Table 20.—Service planes produced in the United States in 1918:

Name of planeJan. 31 to
Mar. 31		Apr. 1 to
June 30		July 1 to
Sept.30		Oct. 1 to
Nov. 8		Total
De Haviland 4 145151,1651,4933,187
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A total of 2,676 pursuit, observation, and day bombing planes, with spare engines, were delivered to the Expeditionary Force by the French Government for the equipment of our forces overseas.

Considerable progress was made in the adaptation of other types of foreign planes to the American-made engines, and in the development of new designs. The U. S. D. 9A, embodying some improvements over the De Haviland 4, was expected to come into quantity production in the near future. The Bristol Fighter, a British plane, was redesigned to take the Liberty 8 and the Hispano-Suiza 300 h. p. engines. A force of Italian engineers and skilled workmen was brought to America to redesign the Caproni night bomber to take three Liberty motors, and successful trial flights of this machine have been made.

Several new models are under experimentation. Chief of these is the Le Père two-seater fighter, designed around the Liberty motor, the performance of which is highly satisfactory. Several of these planes were sent overseas to be tested at the front.

PRODUCTION OF SERVICE ENGINES

In view of the rapid progress in military aeronautics, the necessity for the development of a high-powered motor adaptable to American methods of quantity production was early recognized. The result of the efforts to meet this need was the Liberty motor—America’s chief contribution to aviation, and one of the great achievements of the war. After this motor emerged from the experimental stage, production increased with great rapidity, the October output reaching 4,200, or nearly one-third of the total production up to the signing of the armistice. The factories engaged in the manufacture of this motor, and their total production to November 8, are listed in Table 21.

Table 21.—Production of Liberty motor to November 8, 1918, by factories:

Packard Motor Car Co.4,654
Lincoln Motor Corporation3,720
Ford Motor Corporation3,025
General Motors Corporation 1,554
Nordyke & Marmon Co.433
———
Total13,386