Douglas X-3 Stiletto

Douglas X-3 Stiletto
国	米国
役割	実験的
初飛行	1952年10月15日
構築	1

ザ ダグラス X-3 スティレット ダグラス航空機会社によって製造された細い胴体と長いテーパー機を備えた1950年代の米国の実験ジェット機でした。その主な使命は、主要な機体部品のチタンの最初の使用を含む持続的な超音速速度に適した航空機の設計機能を調査することであった。ダグラスは、約2,000 m.p.hの最高速度を目標にX-3を設計しましたが、しかし、それは真剣にこの目的のために力不足であり、レベル飛行でマッハ1を超えることさえできませんでした。研究機は失望しましたが、ロッキードのデザイナーは、成功したマッハ2戦闘機で同様の台形の翼のデザインを使用したロッキードF-104スターファイターのためのX-3テストからのデータを使用しました。

ソース：ウィキペディアのダグラス X-3 スティレット

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

Click on a photo and use the mouse scroll to view all photos

待って、検索ダグラスX-3スティレットあなたのために.

Douglas X-3 Walk Around
カメラマン	ガーフィールド・イングラム
ローカライズ	知りません
写真	35

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

The Shape of Things to Come

ザ ダグラス X-3 スティレット 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)
役割	Experimental High-Speed Research Aircraft
乗組員	1 (Pilot)
First Flight	October 15, 1952
パワープラント	2 × Westinghouse J34-WE-17 afterburning turbojets
Thrust	3,370 lbf (15.0 kN) each / 4,850 lbf with afterburner
最高速度	Mach 1.21 (Reached) / Mach 2.0 (Design Goal)
翼	22 ft 8 in (6.91 m)
長さ	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 スターファイター, 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.