North American XB-70 Valkyrie

XB-70 Valkyrie
XB-70 leta 1968 NASA foto
Vloga	Strateški bombnik Nadzvočno raziskovalno letalo
Izvor	ZDA
Proizvajalec/-ci	North American
Krstni polet	21. september 1964
Upokojen	4. februar 1969
Status	Upokojen
Glavni uporabniki	USAF NASA
Število izdelanih	2
Cena programa	US$ 1,5 milijard<
Cena enote	US$750 milijonov

North American Aviation XB-70 Valkyrie je bil prototip ameriškega strateškega bombnika, ki naj bi postal B-70. Načrtovalo ga je podjetje North American Aviation v poznih 1950ih. Imel je šest motorjev in naj bi letel pri hitrosti Mach 3 na višini 21 000 metrov. Taka hitrost bi mu omogočila izogibanje lovcem prestreznikom, edino proti bombniško orožje tistega časa, ko vodljive protiletalske rakete še niso bile na voljo oziroma so imele omejene sposobnosti.

Napredne protiletalske rakete, nove interkontinentalne balistične rakete - ICBM in visoka cena bombnika so vodile k ukinitvi programa. En prototip je bil izgubljen v zračnem trčenju z zasledovalnim letalom.

• Posadka: 2
• Dolžina: 189 ft 0 in (57,6 m)
• Razpon kril: 105 ft 0 in (32 m)
• Višina: 30 ft 0 in (9,1 m)
• Površina kril: 6 297 ft² (585 m²)
• Prazna teža: 253 600 lb (115 030 kg)
• Naložena teža: 534 700 lb (242 500 kg)
• Maks. vzletna teža: 542 000 lb (246 000 kg)
• Motorji: 6 × General Electric YJ93-GE-3 turboreaktivni
• Potisk: (suh) 19 900 lbf (84 kN) vsak; potisk z dodatnim zgorevanjem: 28 800 lbf (128 kN) vsak
• Kapaciteta goriva: 300 000 lb (136 100 kg) ali 46 745 US gallons (177 000 L)

• Maks. hitrost: Mach 3,1 (2 056 mph, 3 309 km/h)
• Potovalna hitrost: Mach 3,0 (2 000 mph, 3 200 km/h)
• Dolet: 3 725 nmi (4 288 mi, 6 900 km)
• Višina leta (servisna): 77 350 ft (23 600 m)
• Obremenitev kril: 84,93 lb/ft² (414,7 kg/m²)
• Razmerje vzgon/upor: približno 6 na Mach 2
• Razmerje potisk/teža: 0,314

• Suhoj T-4

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{Commons category|North American XB-70}}

• Pike, Iain (25. junij 1964), »B-70 The State of the Art Improver Part 1«, Flight International: 1055–1062
• Pike, Iain (2. julij 1964), »B-70 The State of the Art Improver Part 2«, Flight International: 18–24
• North American XB-70A, XB-70A Construction pages on National Museum of the USAF site
• NASA/DFRC photos^{[mrtva povezava]} and videos Arhivirano 2016-12-20 na Wayback Machine.
• North American XB-70A Valkyrie presentation 1965 on youtube.com