Douglas X-3 Stiletto

Douglas X-3 Stiletto
국가	미국
역할	실험적인
첫 비행	1952년 10월 15일
내장	1

Tthe 더글러스 X-3 스틸레토 더글러스 항공기 회사가 제조 한 가느 다란 동체와 긴 테이퍼 코를 가진 1950 년대 미국 실험 제트 항공기였습니다. 주요 임무는 지속적인 초음속 속도에 적합한 항공기의 설계 특징을 조사하는 것이 었습니다.이 항공기에는 주요 기체 구성 요소에 티타늄을 처음 사용하는 것이 포함되었습니다. 더글러스는 약 2,000m.p.h의 최대 속도를 목표로 X-3를 설계했지만, 그러나 이러한 목적을 위해 심각하게 전력이 부족했으며 레벨 비행에서 마하 1을 초과 할 수 없었습니다. 연구 항공기는 실망 스러웠지만 록히드 설계자는 성공적인 마하 2 전투기에서 비슷한 사다리꼴 날개 디자인을 사용한 록히드 F-104 스타 파이터에 대한 X-3 테스트의 데이터를 사용했습니다.

소스: 더글러스 X-3 스틸레토 위키백과에

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

Douglas X-3 Stiletto 01

Douglas X-3 Stiletto 02

Douglas X-3 Stiletto 03

Douglas X-3 Stiletto 04

Douglas X-3 Stiletto 05

Douglas X-3 Stiletto 06

Douglas X-3 Stiletto 07

Douglas X-3 Stiletto 08

Douglas X-3 Stiletto 09

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대기,검색 더글러스 X-3 스틸레토 당신을 위해...

Douglas X-3 Walk Around
사진 작가	가필드 잉그램
로컬라이제이션	Unknow
사진	35

참고 항목:

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

The Shape of Things to Come

Tthe 더글러스 X-3 스틸레토 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)
역할	Experimental High-Speed Research Aircraft
승무원	1 (Pilot)
First Flight	October 15, 1952
동력 장치	2 × Westinghouse J34-WE-17 afterburning turbojets
Thrust	3,370 lbf (15.0 kN) each / 4,850 lbf with afterburner
최대 속도	Mach 1.21 (Reached) / Mach 2.0 (Design Goal)
윙스 팬	22 ft 8 in (6.91 m)
길이	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 스타파이터, 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.