The A-10 Thunderbolt II by Andy Ko February 11, 2000 - PowerPoint PPT Presentation

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The A-10 Thunderbolt II by Andy Ko February 11, 2000. http://www.geocities.com/CapeCanaveral/Hall/5777/A-10.html. History. Lessons learned from Korea and Vietnam War Need for close air support Model the A-1 Skyraider AX Program June 1966 - USAF send RFP to 21 companies

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The a 10 thunderbolt ii by andy ko february 11 2000 l.jpg

The A-10 Thunderbolt IIby Andy KoFebruary 11, 2000

http://www.geocities.com/CapeCanaveral/Hall/5777/A-10.html


History l.jpg

History

  • Lessons learned from Korea and Vietnam War

    • Need for close air support

    • Model the A-1 Skyraider

  • AX Program

    • June 1966 -

      • USAF send RFP to 21 companies

      • Parallel Paid Study Contract

    • 1970 - Requirements finalized, bidding starts

      • Northtrop & Fairchild Republic selected for fly-off

    • 1972 - Fly-off begins

    • Jan 1973 - Fairchild’s A-10 announced to be the winner

http://skyraider.org/skyassn/otherpics/mignard/602sos/602sos.htm


Requirements l.jpg

Requirements

  • Speed: 350-400 kts.

  • 250 nm. operational radius with:

    • 9500 lbs external stores and internal ammunition

  • Field Length = 4000 ft. at Max TOGW

  • Simplicity

    • Only proven/off-the-shelf technology

    • Exception: High BPR turbofans

  • Survivability

    • Redundancy

  • Cheap

    • $3.02 Million (F-16 ,F-18, Harrier)

      • F-16, $9.5 - $12.8 Million

      • F-18, $24 Million

      • AV-8B, $23.7 Million

http://www.af.mil/news/factsheets/A_10_OA_10_Thunderbolt_II.html


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Dimensions

Wing span57ft 6in

Length overall53ft 4in

Height overall14ft 8in

Weights

Operating empty24959lbs

Basic design weight30384lbs

Internal fuel10700lbs

Max external load16000lbs

Take-off weights

Maximum50000lbs

CAS mission47094lbs

Anti-armour mission42071lbs

Ferry49774lbs

Never-exceed speed450kts

Max level speed at sea level, clean381kts

Combat speed at 5000ft with six380kts

Mk82 bombs

Cruising speed at sea level300kts

Sea-level rate of climb at design weight6000ft/min

Service ceiling45000ft

Anti-armour configuration, 30min combat, 252nm

40nm penetration and exit

CAS configuration, 1.88hr single-engine250nm

loiter at 5000ft, 10min combat

Ferry range, 50kt headwinds,2240nm

20 min reserve

Performance

Combat radii

Graphics from Dana Bell, “A-10 Warthog in detail & Scale”,


Configuration l.jpg

Configuration

  • Cantilever Low wing

  • Airfoils

    • NACA 6716 on centerline, NACA 6713 at tip

    • Provides low wing loading (92.14 lb/sq ft)

  • Wide Chords

    • Mean wing chord = 8ft 11.32in

  • 2 segment, 3 position Fowler flaps

    • No leading edge devices

  • Wide span ailerons

    • Dual upper and lower surfaces for airbrakes

    • SAS (Stability Augmentation System)

  • H-Tail

    • No deep stall

    • Spin resistance

Graphics from Dana Bell, “A-10 Warthog in detail & Scale”,


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Configuration (Cont’d)

  • Little Sweep

    • Mach number no greater than 0.68

  • Aspect Ratio = 6.54

  • Taper ratio = 0.65

  • Engines

    • TF34-GE-100 (6.2 BPR)

    • 9065 lbs. Static thrust

    • Turbofan vs. Turboprop vs. Turbojet?

    • Placement

      • Nozzles are canted 9º upward

  • Landing Gear

    • Forward retracting

    • Exposed wheels when retracted

http://www.a-10.org/photos/photos5.html

http://www.a-10.org/photos/photos6.html


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Improvements / Fixes

  • Stall problem

    • Initially a fixed slat was installed, later changed to a movable slat

    • Stall strip added to the leading edge

    • Wing root modified with a fillet

    • Forward projecting strakes

  • Drag improvements

    • Increased wing-span by 30 in.

    • Hoerner wingtips

      • Induced drag

      • Aileron effectiveness

    • Canopy and windscreen shapes refined

    • Pylons shortened and streamlined

    • Reduced landing gear pod cross section

http://www.a-10.org/photos/photos7.html

http://www.a-10.org/photos/photos.html


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Comparison with other Attack Aircraft

* With combat load

** With external fuel tanks (tanks retained)


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Survivability and Lethality

  • Redundant control system

    • 2 hydraulic controls (separated) and 1 cable manual reversion

    • H-tail provides 2 separated control surfaces

  • Redundant structure

  • Titanium bathtub for pilot

    • 1.5 in thick bulletproof canopy

  • Weapon loads

    • GAU-8/A Avenger 30mm seven barrel gun

      • 1350 rounds at 2100 or 4200 rounds/min

    • 11 store pylons with max external load of 16000 lbs

Smithsonian Air & Space Magazine,

March 1999, pg 27


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