Republic XF-91

Republic XF-91
Země	SPOJENÉ STÁTY
Roli	Prototyp stíhacího letadla
První let	9. května 1949
Postaven	2

Tá Republika XF-91 Thunderceptor (původně označen XP-91) je prototyp stíhacího letounu se smíšeným pohonem vyvinutý společností Republic Aviation. Letadlo by pro většinu letu používalo proudový motor a shluk čtyř malých raketových motorů pro přidaný tah během stoupání a zachycení. Konstrukce byla v době dokončení do značné míry zastaralá kvůli rychle rostoucímu výkonu současných proudových motorů a byly postaveny pouze dva prototypy. Jedním z nich byl první americký stíhač, který překonal Mach 1 v letu.

Zdroj: Republika XF-91 na Wikipedii

Republika XF-91
Fotografů	John Heck, Vladimir Jakubov
Lokalizace	Národní letecké a kosmické muzeum, Washington DC
Fotografie	99

Republic XF-91 Thunderceptor 01

Republic XF-91 Thunderceptor 02

Republic XF-91 Thunderceptor 03

Republic XF-91 Thunderceptor 04

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Republic XF-91 Thunderceptor 08

Republic XF-91 Thunderceptor 09

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General Characteristics and Role

The Republic XF-91 Thunderceptor was an experimental prototype interceptor aircraft developed for the U.S. Air Force (USAF) in the late 1940s. Its primary role was to explore the concept of a high-performance, short-range interceptor that could rapidly climb to high altitudes and intercept enemy bombers. To achieve this, the aircraft was equipped with a revolutionary mixed-propulsion system combining a turbojet engine for cruise and four rocket engines for bursts of acceleration during combat or climb. The XF-91 is perhaps best known for its uniquely designed inverse tapered wings, a feature intended to mitigate Mach tuck and improve low-speed handling.

Property	Typical Value (XF-91)
Roli	Experimental Mixed-Power Interceptor
National Origin	Spojené státy americké
Výrobce	Republic Aviation Company
First Flight	9. května 1949
Posádky	1 (Pilot)
Délka	13.23 m (43 ft 5 in)
Rozpětí křídel	9.51 m (31 ft 2 in)
Gross Weight	8,870 kg (19,550 lb)

Propulsion and Aerodynamics

Primary Engine: 1 x General Electric J47-GE-3 turbojet engine (in the rear fuselage).
Turbojet Thrust: 23.35 kN (5,200 lbf) (dry).
Auxiliary Power: 4 x Reaction Motors XLR11 liquid-fueled rocket engines (mounted in the tail above and below the jet exhaust).
Rocket Thrust: Approx. 26.7 kN (6,000 lbf) total for short bursts.
Maximum Speed: Mach 1.71 (achieved in a later powered flight). It was the first U.S. fighter to exceed Mach 1 in level flight using a mixed-propulsion system.
Inverse Taper Wing: The wing chord was wider at the tip than at the root (the inverse of conventional taper). This arrangement maintained high lift at the tips, helping to prevent tip stall and improve control at high angles of attack.
Landing Gear: Featured a unique bicycle-style main landing gear with two main wheels side-by-side at the center of the fuselage, supported by small outrigger wheels under the wingtips.

Program Outcome and Legacy

Technical Success: The XF-91 proved the feasibility of using rocket augmentation for performance bursts and demonstrated the viability of the inverse taper wing concept for high-speed flight control.
Cancellation: Despite its technical achievements, the program was canceled in 1952. The development of more powerful, conventional turbojet engines (which eliminated the need for complex, short-duration rocket power) and the rise of the superior all-jet F-104 Starfighter made the mixed-power interceptor obsolete.
Legacy: The inverse taper wing design, while not adopted, was an important piece of research. The aircraft’s testing provided vital data on high-Mach flight and supersonic stability.
Preservation: The sole remaining prototype is preserved and displayed at the National Museum of the United States Air Force at Wright-Patterson AFB in Dayton, Ohio.

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