Douglas X-3 Stiletto | |
|---|---|
| Ország | Usa |
| Szerepet | Kísérleti |
| Első repülés | 1952. október 15. |
| Beépített | 1 |
A Douglas X-3 tűsarkú was a 1950s United States experimental jet aircraft with a slender fuselage and a long tapered nose, manufactured by the Douglas Aircraft Company. Its primary mission was to investigate the design features of an aircraft suitable for sustained supersonic speeds, which included the first use of titanium in major airframe components. Douglas designed the X-3 with the goal of a maximum speed of approximately 2,000 m.p.h, but it was, however, seriously underpowered for this purpose and could not even exceed Mach 1 in level flight. Although the research aircraft was a disappointment, Lockheed designers used data from the X-3 tests for the Lockheed F-104 Starfighter which used a similar trapezoidal wing design in a successful Mach 2 fighter.
| Douglas X-3 Stiletto Walk Around | |
|---|---|
| Photographers | Randy Ray, John Heck |
| Localisation | National Museum of the USAF |
| Photos | 64 |
| Douglas X-3 Walk Around | |
|---|---|
| Fotós | Garfield Ingram |
| Lokalizáció | Ismeretlen |
| Fénykép | 35 |
Lásd még:
| Douglas X-3 Stiletto Walk Around | |
|---|---|
| Photographer | Meindert de Vreeze |
| Localisation | National Museum of the USAF |
| Photos | 44 |
The Shape of Things to Come
A Douglas X-3 tűsarkú was perhaps the most visually striking experimental aircraft of the 1950s. Designed to test the effects of sustained supersonic flight, it featured a slender fuselage, a long, tapered nose, and tiny, trapezoidal wings. While the X-3 failed to reach its intended design speeds due to being severely underpowered, it became an invaluable research tool for structural engineering, pioneering the use of titanium in aircraft construction and providing the data that made the Lockheed F-104 Starfighter possible.
| Attribute | Technical Specification (Douglas X-3) |
|---|---|
| Szerepet | Experimental High-Speed Research Aircraft |
| Legénység | 1 (Pilot) |
| First Flight | October 15, 1952 |
| Hajtómű | 2 × Westinghouse J34-WE-17 afterburning turbojets |
| Thrust | 3,370 lbf (15.0 kN) each / 4,850 lbf with afterburner |
| Maximum Speed | Mach 1.21 (Reached) / Mach 2.0 (Design Goal) |
| Szárnyfesztávolsága | 22 ft 8 in (6.91 m) |
| Hossza | 66 ft 9 in (20.35 m) |
Design Innovations and Challenges
- High Fineness Ratio: The X-3 had an incredibly high “fineness ratio” (length vs. width), designed to pierce the “sound barrier” with minimal drag. Its nose was so long that the pilot sat far back from the tip, necessitating a specialized downward-ejection seat.
- The First Titanium Jet: The X-3 was the first aircraft to make extensive use of titanium in its major airframe components. This was necessary to handle the “thermal thicket”—the intense heat generated by air friction at speeds above Mach 2.
- Underpowered Reality: The original plan called for Westinghouse J46 engines, which failed to materialize. The substitute J34 engines were so weak that the X-3 could barely exceed Mach 1 in a level flight, usually requiring a dive to reach supersonic speeds.
- Trapezoidal Wings: The wings were tiny, thin, and straight (non-swept). This design offered low drag at supersonic speeds but made takeoffs and landings extremely dangerous, with a landing speed of roughly 200 mph (322 km/h).
Inertial Coupling and Legacy
- Inertial Coupling Discovery: During a test flight in 1954, pilot Joseph Walker experienced “inertial coupling”—a violent, uncontrollable roll/yaw maneuver caused by the mass distribution of the long fuselage. This data was critical in redesigning the tail surfaces of the F-100 Super Sabre.
- The “Starfighter” Connection: The thin, stubby wing data from the X-3 was directly applied by Kelly Johnson at Lockheed to create the F-104 Csillagharcos, often called the “Missile with a Man in It.”
- Tire Technology: Because of its exceptionally high takeoff and landing speeds, the X-3 forced engineers to develop entirely new high-pressure tire compounds and heat-resistant wheel assemblies.
- Preservation: The sole surviving X-3 Stiletto is currently on display at the National Museum of the United States Air Force in Dayton, Ohio.
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