Douglas X-3 Stiletto

Douglas X-3 Stiletto
Zemlja	Sad
Ulogu	Eksperimentalni
Prvi let	15 Oktobar 1952
Izgradio	1

Čaj Daglas X-3 Stiletto bio je 1950-ih američki eksperimentalni mlazni avion sa vitkim trupom i dugim trakastim nosem, koji je proizvela avionska kompanija Daglas. Njegova primarna misija bila je da istraži dizajnerske karakteristike aviona pogodnog za održive supersonične brzine, koje su uključivale prvu upotrebu titanijuma u velikim komponentama aviona. Daglas je osmislio X-3 sa ciljem maksimalne brzine od približno 2.000 m.p.h, ali je, međutim, bio ozbiljno potcenjen u tu svrhu i nije mogao da premaši ni Mach 1 u nivou leta. Iako je istraživački avion bio razočarenje, dizajneri Lokida su koristili podatke sa X-3 testova za Lokid F-104 Starfighter koji je koristio sličan dizajn krila trapezoidala u uspešnom lovcu Mach 2.

Izvor: Daglas X-3 Stiletto na Vikipediji

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
Lokalizacija	Nepoznato
Fotografije	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

Čaj Daglas X-3 Stiletto 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)
Ulogu	Experimental High-Speed Research Aircraft
Posada	1 (Pilot)
First Flight	October 15, 1952
Powerplant	2 × Westinghouse J34-WE-17 afterburning turbojets
Thrust	3,370 lbf (15.0 kN) each / 4,850 lbf with afterburner
Maksimalna brzina	Mach 1.21 (Reached) / Mach 2.0 (Design Goal)
Raspon krila	22 ft 8 in (6.91 m)
Dužina	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.