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Douglas X-3 (Stiletto)

1952 COLD WAR X-PLANE

History

The Douglas X-3 exists only as a research aircraft, designed to study obstacles to sustained, jet-powered, supersonic flight at the speed of a Mach 2 military aircraft. The alternative is rocket propulsion, but these systems are fuel-intensive and have limited tactical range in terms of fighter/interceptor.

Turbojets suffered from some of the same limitations, which in turn limited the range and performance of many postwar designs. Hybrid aircraft have been considered, which retain the use of a rotary propeller engine combined with a rocket or turbojet to increase thrust.

However, these fighters did not exhibit significant performance advantages over the best piston-powered, propeller-driven fighters of World War II and beyond.

By the late 1940s, jet development continued to the point where the next major conflict would result in the first jet-to-jet showdown over the Korean peninsula. North American F-86 Saber and Mikoyan-Gurevich MiG-15 "Fagot" fighter jets from the Korean War, among other well-known types.

Despite their sleek designs and jet propulsion systems, these planes can only reach speeds of Mach 1 in a dive. They were looking for planes that could consistently run faster and exceed the Mach 1 limit to stay there.

X-3 follows the famous American Bell X-1 and other mounts. Derived from the work of Francis Clauser, Schuyler Kleinhans and Baily Oswald, the new design became one of the most unique and recognizable research vessels of the 1950s. The resulting fuselage was so slim that it could fit the required 2 Westinghouse J34 afterburner turbojets side-by-side, as well as the required fuel storage, control system, landing gear and cockpit. As a result, the main wing roots can be kept fairly short in length and with a straight design approach, with their thin chords providing as little drag as possible.

The empennage is an extension of the fuselage and is fitted with a very small area of ??the fin. The cockpit is nested in the circular fuselage, and the canopy is well integrated while providing the pilot with limited visibility.

At the front, the tip of the aircraft is very sharp, which complements the sleek design of the X-3. The aircraft is also equipped with retractable tricycle landing gear, allowing it to taxi, take off and land on its own without the need for a mothership launch.

The X-3 is known for being one of the first aircraft to use titanium in its structure.

Due to its very unorthodox, futuristic shape, the X-3 was known as the "Stiletto" for its dagger-like appearance.

The US Air Force ordered two airworthy X-3s in June 1945 (World War II would end in August of that year). In June 1949, the manufacture of the pair of shoes was officially authorized. Initially, the program sought to use 2 Westinghouse J46 afterburner turbojets, each rated at 6,600 lbs, but were eventually replaced by lower thrust 4,850 lbs (each) Westinghouse J34s, as the expected J46s did not meet the program requirements.

However, work on the X-3 continued into the early 1950s, when the first aircraft made its maiden flight over a dry lake bed on October 15, 1952, while taxiing at high speed. In December 1953, the aircraft was handed over to the United States Air Force for continued flight.

So far, the many shortcomings of the X-3 have been exposed. Chief among them is that the X-3 is underpowered, which hinders performance. Pilots also mentioned poor controls, which made the X-3 a deadly plane to fly at any time. In fact, the design failed to reach the intended Mach 2 speed in sustained flight, and a top speed of Mach 1.2 was only achieved through a 30-degree dive.

Even the Mach 1.0 barrier proved elusive, requiring the X-3 to enter a 15-degree dive. The X-3 was more or less the failure of its test program, and was decommissioned at short notice. Its last flight was on May 23, 1956 (51 flights in total), and the planned second X-3 was never completed. The only X-3 then became a museum exhibit at the U.S.

Air Force Museum in Dayton, Ohio.

Although the X-3 never achieved its planned goals, it provided valuable research data on "inertial coupling," a lethal concentration of aerodynamic loads that can endanger the aircraft and crew within seconds (This phenomenon led to the formation of the famous North American F-100 Super Sabre). The X-3's thin wings also influenced the upcoming Lockheed F-104 "Starfighter," which used similarly short, slender "short wings" in its configuration.