Douglas X-3 Stiletto

Douglas X-3 Stiletto
Land	Usa
Roll	Experimentell
Första flygningen	15 oktober 1952
Byggd	1

Den Douglas X-3 Stilett , var ett amerikanskt experimentellt jetflygplan från 1950-talet med en smal flygkropp och en lång avsmalnande nos, tillverkat av Douglas Aircraft Company. Dess primära uppdrag var att undersöka designegenskaperna hos ett flygplan som var lämpligt för ihållande överljudshastigheter, vilket inkluderade den första användningen av titan i viktiga flygplanskomponenter. Douglas konstruerade X-3 med målet att ha en maxhastighet på cirka 2 000 m.p.h, men den var dock kraftigt underdimensionerad för detta ändamål och kunde inte ens överstiga Mach 1 i planflykt. Även om forskningsflygplanet var en besvikelse, använde Lockheeds konstruktörer data från X-3-testerna för Lockheed F-104 Starfighter som använde en liknande trapetsformad vingdesign i ett framgångsrikt Mach 2-jaktplan.

Källkod: Douglas X-3 Stilettklack på Wikipedia

Douglas X-3 Stiletto Walk Around
Photographers	Randy Ray, John Heck
Localisation	National Museum of the USAF
Photos	64

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Douglas X-3 Walk Around
Fotograf	Garfield Ingram
Lokalisering	Unknow
Bilder	35

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Douglas X-3 Stiletto Walk Around
Photographer	Meindert de Vreeze
Localisation	National Museum of the USAF
Photos	44

The Shape of Things to Come

Den Douglas X-3 Stilett 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)
Roll	Experimental High-Speed Research Aircraft
besättning	1 (Pilot)
First Flight	October 15, 1952
Kraftverk	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)
Spännvidd	22 ft 8 in (6.91 m)
längd	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 Starfighter, 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.