Eagle-class patrol craft

The Eagle class patrol craft were a set of steel ships smaller than destroyers but having a greater operational radius than the wooden-hulled, 110 ft submarine chasers developed in 1917. The submarine chasers' range of about 900 mi at a cruising speed of 10 knots (19 km/h) restricted their operations to off-shore anti-submarine work and denied them an open-ocean escort capability; their high consumption of gasoline and limited fuel storage were handicaps the Eagle class sought to remedy.

They were originally commissioned USS Eagle Boat No.1 (or 2,3..etc.) but this was changed to PE-1 (or 2,4.. etc.) in 1920. They never officially saw combat in World War I, but some were used during the Allied intervention in the Russian Civil War. PE-19, 27, 32, 38, 48 and 55–57 survived to be used in World War II.

Attention turned to building steel patrol vessels. In their construction, it was necessary to eliminate the established shipbuilding facilities as possible sources of construction as they were totally engaged in the building of destroyers, larger warships, and merchant shipping. Accordingly, a design was developed by the Bureau of Construction and Repair which was sufficiently simplified to permit speedy construction by less experienced shipyards.

Involvement of Ford motor company
In June 1917, President of the United States Woodrow Wilson had summoned auto-builder Henry Ford to Washington in the hope of getting him to serve on the United States Shipping Board. Wilson felt that Ford, with his knowledge of mass production techniques, could immensely speed the building of ships in quantity. Appraised of the need for antisubmarine vessels to combat the U-boat menace, Ford replied, "what we want is one type of ship in large numbers."

On 7 November, Ford accepted membership on the Shipping Board and an active advisory role. Examining the Navy's plans for the projected steel patrol ships, Ford urged that all hull plates be flat so that they could be produced quickly in quantity and he also persuaded the Navy to accept steam turbines instead of reciprocating steam engines.

At this point, Secretary of the Navy Josephus Daniels was drawn into the project. He recognized that no facilities were available at the Navy yards for building new craft and asked Ford if he would undertake the task. Ford agreed, and, in January 1918, he was directed to proceed with the building of 100 of them. Later on, 12 more were added for delivery to the Italian government.

Construction
Ford's plan for building the ships was revolutionary. Establishing a new plant on the River Rouge on the outskirts of Detroit, he proposed to turn them out as factory products, using mass production techniques, and employing factory workers. He would then send the boats by the Great Lakes and the St. Lawrence River to the Atlantic coast. However, Ford had little part in the design of the boats. Except for his insistence upon simple plans and the use of steam turbines, he contributed little of a fundamental nature to the design concept.

The assembly plant was completed in five months, and the first keel was laid in May 1918. The machinery and fittings were largely built at Ford's Highland Park plant in Detroit. At first, Ford believed that boats could be sent down a continuously moving assembly line like automobiles. The size of the craft made this too difficult, however, and a "step-by-step" movement was instituted on the 1700 ft line. The first Eagle boat was launched on 11 July. The launching of these 200 ft craft was a formidable operation. Not built on ways from which they could slide into the water, the hulls moved slowly from the assembly line on enormous, tractor-drawn flatcars. They were then placed on a 225 ft steel trestle alongside the water's edge which could be sunk 20 ft into the water by hydraulic action.

The original contract called for delivery of 100 ships by 1 December 1918. Although the first seven boats were completed on schedule, succeeding ones did not follow as rapidly, even though the labor force reached 4,380 by July and later peaked at 8,000. The chief reasons were Ford's excessive initial optimism and the inexperience of labor and supervisory personnel in shipbuilding. Upon the signing of the Armistice in November 1918, the number under contract, previously raised from 100 to 112, was cut to 60. Of these, seven were commissioned in 1918, and the remaining 53 were commissioned in 1919.

The entire Eagle Boat operation came briefly under challenge by Senator Henry Cabot Lodge of Massachusetts in December 1918. At the ensuing Congressional hearings, Navy officials successfully defended the boats as being a necessary experiment and well made while Ford profits were proved to be modest.

US service
The term "Eagle Boat" stemmed from a wartime Washington Post editorial which called for "...an eagle to scour the seas and pounce upon and destroy every German submarine." However, the Eagle Boats never saw service in World War I. Reports on their performance at sea were mixed. The introduction, at Ford's insistence, of flanged plates instead of rolled plates facilitated production but resulted in sea-keeping characteristics which were far from ideal. In the first years after the war, a number of them were used as aircraft tenders. Despite the handicap of their size, they serviced photographic reconnaissance planes at Midway in 1920 and in the Hawaiian Islands in 1921 before being supplanted by larger ships. A number of the Eagle Boats were transferred to the United States Coast Guard in 1919, and the balance were sold in the 1930s and early 1940s. These vessels were used during World War II. One was stationed in Miami as a training vessel.

Ships
PE-61 through PE-112 were canceled on 30 November 1918. PE-5, PE-15, PE-25, PE-45, PE-65, PE-75, PE-86, PE-95, PE-105, and PE-112 were allotted for transfer to Italy, though this plan was cancelled and none were ever delivered.