The BLACKBIRD, revisited in BLACKSBURG. Presented by: Pedro De Oliveira Michael Libeau on April 21,...
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Transcript of The BLACKBIRD, revisited in BLACKSBURG. Presented by: Pedro De Oliveira Michael Libeau on April 21,...
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The BLACKBIRD,
revisited in BLACKSBURG.
Presented by:
Pedro De Oliveira
Michael Libeau
on April 21, 2000.
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Motivation for the project
• American intelligence forecasted U-2 vulnerability– Subsonic cruise speed
– 70 kft ceiling
– 1750 nm range
• Improved Russian missile technology plotted (SAM’s)
• U-2 being shot down on May 1, 1960 over U.R.S.S. reinforced the idea
• Government asked for a new aircraft– low radar cross-section aircraft
– Mach 3+ cruising speed (continuous!)
– altitudes in excess of 80 kft.
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One idea… The SUNTAN Project
[Jenkins], p. 6
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Another idea...Project Oxcart - Archangel II
[Jenkins], p. 7
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A12 - the definitive idea
[Whitford], p. 188
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The U2 and the SR-71
Drendel p 36
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The several versions
Drendel 8
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SR-71A General Data• Primary function: Strategic Reconnaissance
• Wing span = 55 ft 7in (16.942 m)
• Length = 107 ft, 5 in (32.741 m)
• GTOW = 140,000 lbf (63,500 kgf)
• Engine@Thrust = 2 J58@32,500 lbf (65,000 lbf SLST)
• Max speed = Mach 3.31 (World record speed)
• Rate of Climb = 10,000+ fpm
• Ceiling = 85,069 ft (also a World record)
• Range = 2,982 nm at Mach 3, 74,740 ft, on internal fuel
• Endurance on internal fuel, at loiter speed= 7h,
• At above range 1h20min over target area
• Manufacturer: Lockheed (McNamara ordered tooling destroyed)
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Speed Comparison(“faster than a rifle bullet”)
• Mig-25 engines reported being destroyed after flying at 3.2M. Unofficial maximum speed was 2.8M
• XB-70 only dashed at 3.2M - most of the flight was subsonic.
• The SR-71 used to fly at 3.0M+ for hours.
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Thrust-to-Weight Ratio Comparison
• The Mig-25 fuselage has a much smaller fineness ratio.
Jane’s, 74/75
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Wing-Loading Comparison
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More on T/W x W/S Comparison
XB-70Concorde
SR-71
MIG-25
[Whitford], p. 39
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Wing Geometry ComparisonSpeed increase demands thinner wings.
[Whitford], p. 30
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Speed increase also demands larger turn radii.
[Jenkins], p. 93
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Aerodynamic ConsiderationsAnother application of the KISS methodology
• High fineness ratio bodies
• Highly swept double-delta wing.
[Whitford], p. 188
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Aerodynamic Considerations - FUSELAGE
• High fineness ratio for minimum wave drag• Use of chines:
– better directional stability: reduction of the side-force
– offset the backward movement of the A.C. with Mach number
[Whitford], p. 150[Whitford], p. 150
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Aerodynamic Considerations - WING
• Double-delta plan form allows high (t/c) ratio to minimize wave drag
• Swept keeps most of the wing in Mach cone :– For Mach 3.0 flight
– SR-71 wing sweep angle:
• Conical camber– moves the center of lift inboard
– relieves loading on engine nacelle structure due to outboard wing
– reduction in high rolling moment due to sideslip inherent to highly swept wings
)1
(sin90 1
Mcone−−ϒ=Λ
ϒ=Λ 5.70cone
ϒ=Λ 60LE
[Whitford], p. 188
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Aero Considerations - VERTICAL TAILS
• All moving tails (+20/-20 deg)
• Cant angle to – reduce induced rolling moment when r ≠ 0
– stay on the correct side of the vortices shed by the nacelles - reduced VT deflection at low speed with ≠ 0
Whitford, p. 195
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Vortices - I
Crickmore p 66
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Vortices - II
Crickmore p 181
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The all-moving VTs.
Drendel p 20Crickmore p 44
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Stable or unstable?
Drendel p 45
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YF-12 needed improved directional stability
Drendel p 12 Drendel p 17
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Fins must fold for landing.
Drendel p 15
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Aero Considerations - Aerodynamic Heating
• The SR-71, a hot airplane:– 600 F at nose (aerodynamic heating at Mach 3+)
– 520 F at the windshield glass
– 1200 F at the exhaust nozzle (fuel burned)
• 93% of the structural weight built of Titanium alloys
• Cord-wise corrugations on wing skin
• The utility of the black paint (lower temps., lower RCS)
• Nitrogen both in tires and in fuel tank
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Aero Considerations - Aerodynamic Heating
• Fuel used also as coolant• JP-7, a high-flashing point fuel• Fuel leakage always a problem• Special hydraulic fluids (powders?) to operate at 600 F• Special tires, retracted into the fuselage fuel tank area
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Fuel leakage always a problem
Air&Space Magazine, Feb/Mar 99, vol. 13 (6)
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Propulsion: Turbojet or Ramjet?
• At Mach 3 cruise, turbojet engine makes only 17% of total thrust
AIAA-69-757, p. 7
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Turbo-ramjet: a hybrid propulsion system
AIAA-69-757, p. 7 AIAA-69-757, p. 7
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Flow must decelerate from supersonic to subsonic before the compressor first stage
http://www.airspacemag.com/asm/mag/supp/fm99/oxcart.html
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Missions
• Reconnaissance (it should be RS, Pres. Johnson turned it SR)
• Interceptor (YF-12)
• Mother-ship
• Research Vehicle
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Typical Reconnaissance Mission
Crickmore p 69
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A modern ship, but alsoa mother-ship.
Jenkins p 50
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The mother-ship delivery.
Jenkins p 44
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SR-71 in High Speed Research
• NASA Dryden currently is conducting high speed flight research using two SR-71 aircraft.
• Excellent platforms to carry out research and experiments in a variety of areas (aerodynamics, propulsion,structures, thermal protection materials, high-speed and high-temperature instrumentation, atmospheric studies and sonic boom characterization)
• Data from the SR-71 high-speed research program will be used to aid designers of future supersonic/hypersonic aircraft and propulsion systems, including a high-speed civil transport.
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NASA’s SR-71 and A-12
http://www.dfrc.nasa.gov/Projects/SR71/home.html
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Bye-bye, Blackbird.
[Jenkins], p. 85
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One airplane, several names
• A(rchangel)-12
• Blackbird
• Cygnus
• Habu
• Senior Crown
• SR-71 as Strategic Reconnaissance, but also...
• YF-12
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Reference List
• Burrows, William E., “The Oxcart Cometh,” Air&Space Magazine, Vol. 13 (6), Smithsonian Institution, Washington, D. C., Feb./Mar. 1999.
• Crickmore, Paul F., “LOCKHEED SR-71 – The Secret Missions Exposed,” BAS Printers Limited, Great Britain, 1993.
• Drendel, Lou, “SR-71 Blackbird in action,” Squadron/Signal Publications, Inc., Carrolton, TX, 1982.
• “Jane’s All the World Aircraft” from years 68/69, 69/70, 74/75.
• Jenkins, Dennis R., “SR-71/YF-12 BLACKBIRDS”, WARBIRDTECH series, vol. 10, Specialty Press Publishers and Wholesalers, 1997.
• Johnson, Clarence L., “Some Development Aspects of the YF-12A Interceptor Aircraft,” AIAA Paper No. 69-757, 1969.
• Whitford, Ray, “Design for Air Combat”.