The Thomas-Morse S-4 Scout was an Americanbiplane advanced trainer, operated by the United States Army and the United States Navy. Dubbed the "Tommy" by pilots who flew it, the aircraft became the favorite single-seat training airplane produced in the U.S. during World War I. It had a long and varied career beginning with the S-4B, which first appeared in the summer of 1917.
The S-4B, with a Gnome, a span of 27’, and length of 20’3” proved more successful, with three prototypes followed by an order of 97 for the Army and 10 for the Navy, while six more were completed with two main and one tail floats as the Navy S-5. The S-4B was used by practically every pursuit flying school in the U.S. during 1918. It was supplemented in 1918 by the S-4C, at a cost of US$5400 each. Six prototypes were built, and the Gnome 9B-2 was replaced by the more reliable Le Rhône 9C starting with the fifty-second production aircraft. 461 S-4Cs went to the Army and four S-4Cs with floats went to the Navy. After World War I, many "Tommys" were sold as surplus to civilian flying schools, sportsman pilots, and ex-Army fliers. Many were still being used in the mid-1930s for World War I aviation movies, and several continue to exist in flying condition today.
A single aircraft was fitted with new tail and the more powerful Le Rhone 9Jrotary engine, becoming the S-4Eaerobatic trainer. It was not adopted by the military, and after being fitted with a AeromarineV8 engine, it became Basil Rowe‘s racer Space-Eater. About sixty surplus aircraft survived in civil service, most of which were fitted with the Curtiss OX-5.
4366 – S-4B was restored over the course of 15 years by the Ithaca Aviation Heritage Foundation in Ithaca, New York. It is made up of the fuselage of an S-4B, a top wing of a S-4C, and a reproduction bottom wing. Restoration was completed in 2018, and on September 29, the plane took off from the Ithaca Tompkins Regional Airport and flew multiple circuits above a large crowd gathered in honor of the Tommy’s 100th birthday. It then successfully landed. The pilot was Ken Cassens of Rheinbeck. Now that the plane has flown once, there are no plans for it to fly again. Instead it will be installed in a permanent exhibit at the Ithaca Heritage Center, being constructed in the new Ithaca Heritage Center, the former Tompkins Trust building on the Ithaca Commons. The plane was previously owned by William N. Thibault.
S-4B on static display at the National Museum of the Marine Corps in Triangle, Virginia. It was obtained in a trade with the Aeroflex Museum in 1979 and was restored by Century Aviation. This aircraft has original S-4B wings mounted on a reproduction B-fuselage, which was fabricated using parts from the prototype S-4.
S-4C under restoration at the Pioneer Flight Museum in Kingsbury, Texas.
S-4 under restoration Pioneer Flight Museum in Kingsbury, Texas.
S-4 on static display at the Cradle of Aviation Museum in Garden City, New York. It is an uncovered Scout fuselage, possibly from one of the prototypes, fitted with a LeRhone engine and a working gun synchronizer.
