• Review: Virtavia - XB-70 Valkyrie

    North American XB-70 Valkyrie

    Publisher: Virtavia

    Review Author:
    Ray Andersen

    Suggested Price:
    $25.00

    Buy Here

    Intro

    The XB-70 is a delta winged, high altitude, six engine, supersonic strategic bomber and research aircraft prototype for the proposed B-70, capable of flying Mach 3+ and with a service ceiling at an altitude of 70,000+ feet.

    The XB-70 was designed in the 1950s by North American and later built in the 1960s even though the B-70 program was cancelled. In total only two aircraft were built and they received the nickname Valkyrie.

    One of the most characteristic features that the Valkyrie had, was that the outer portions of the wings were hinged and could be pivoted downward by up to 65 degrees which increased the directional stability during supersonic flight, but this feature also shifted the center of lift to a more favorable position and strengthened the compression lift effect because the wings now further trapped the shock wave created under the wings.

    General Information & Aircraft Specs:

    • Produced by: North American Aviation
    • First flight: 21st of September 1964
    • Role: Strategic bomber / Supersonic research aircraft
    • Status: Retired 4th of February 1969
    • Built: 2
    • National: origin United States
    • Unit cost: US$750 million (average cost)
    • Primary users:
      • United States Air force
      • NASA
    • Crew: 2 (original intended was 4)
    • Length: 189 ft 0 in (57.6 m)
    • Wingspan: 105 ft 0 in (32.0 m)
    • Height: 30 ft 0 in (9.1 m)
    • Wing area: 6,297 ft2 (585 m2)
    • Airfoil: Hexagonal 0.30 Hex modified root, 0.70 Hex modified tip
    • Empty weight: 253,600 lb (115,030 kg) - operating empty weight
    • Loaded weight: 534,700 lb (242,500 kg)
    • MTOW: 542,000 lb (246,000 kg)
    • Power plant: 6x General Electric YJ93-GE-3 afterburning turbojet
      • Dry thrust: 19,900 lbf (84 kN) each
      • Thrust with afterburner: 28,800 lbf (128 kN each
    • Fuel: JP-6
    • Internal fuel capacity: 300,000 lb (136,100 kg) or 46,745 US gallons (177,000 L)
    • Maximum speed: Mach 3.1 (2,056 mph / 3,309 km/t)
    • Cruise speed: Mach 3.0 (2,000 mph / 3,200 km/t)
    • Range: 3,725 nmi (4,288 mi / 6,900 km) - on combat mission
    • Service ceiling: 77,350 ft (23,600 m)
    • Wing load: 84.93 lb/ft2 (414.7 kg/m2)
    • Lift-to-drag: approximately 6 at Mach 2
    • Thrust/weight: 0.314

       


    6 Comments
    1. Barkingside's Avatar
      Barkingside -
      I doubt very much that an accurate simulation of this a/c is possible in a $50 simulator. Still. it is nice to fantasise
    1. BobK's Avatar
      BobK -
      The manual is the file valkyrie.htm in the plane's main directory (SimObjects/Virtavia XB-70 Valkyrie/valkyrie.htm). The charts are from the images directory, which are intended to be displayed within valkyrie.htm.

      A bit unusual for the docs to be an html page, but there it is.
    1. byron1976's Avatar
      byron1976 -
      I don't think that this plane actually could stall, since it's a canard
    1. hdavidh's Avatar
      hdavidh -
      The Canards on the XB70 were fixed, im pretty sure they were not designed to be control surfaces like on modern fighters such as the Eurofighter and Rafale.
      Also the reviewer made mention of the ejection seats being a catapault seat and having difficulty seeing to the sides, they were not actually seats, but capsules designed to enclose and protect the crew during mach 3 ejections. a quick google image search found plenty of images of the cockpit including ejection capsules.
    1. byron1976's Avatar
      byron1976 -
      Quote Originally Posted by hdavidh View Post
      The Canards on the XB70 were fixed, im pretty sure they were not designed to be control surfaces like on modern fighters such as the Eurofighter and Rafale.
      Sorry, but the canards on the XB-70 had active control surfaces, as they're in the Eurofighter and the Rafale that you mention. There are many pictures of the canards in the XB-70 on take off moment showing that they have control surfaces.
      Yo can see them here
      http://blogdebill.com/wp-content/upl...0frontLeft.jpg
    1. player2's Avatar
      player2 -
      Quote Originally Posted by byron1976 View Post
      Sorry, but the canards on the XB-70 had active control surfaces, as they're in the Eurofighter and the Rafale that you mention. There are many pictures of the canards in the XB-70 on take off moment showing that they have control surfaces.
      Yo can see them here
      http://blogdebill.com/wp-content/upl...0frontLeft.jpg
      Yes and No,

      The Canards on both 62-0001 and 62-0207 (A/V-2) both were simply geared to the Elevons for trimmed stable horizontal flight purposes only, not "Active" as on the Eurofighter in anyway shape or form.

      the picture you reference is simply showing canard flaps in down position.

      I have several hours of flight video, pilot interviews and official publications to back that up.

      here is one resource you might enjoy:
      http://www.nasa.gov/centers/dryden/p...main_H-426.pdf
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