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    Re: bubble sextant in U-2
    From: Gary LaPook
    Date: 2013 Jan 24, 09:08 -0800
    You can also read details of precomputation at :




    --- On Sun, 1/13/13, Paul Hirose <cfuhb-acdgw@earthlink.net> wrote:

    From: Paul Hirose <cfuhb-acdgw@earthlink.net>
    Subject: [NavList 21932] Re: bubble sextant in U-2
    To: garylapook@pacbell.net
    Date: Sunday, January 13, 2013, 9:59 AM

    Air Force Manual 51-40, "Air Navigation" vol. II (1955) has a section on
    fighter celestial navigation. This is likely the method used by the U-2
    "With this technique, there is no plotting and very little computation
    requred in the air. All that need be done is to make an observation and
    compare the sextant readings with precomputed values for the time of the
    observation... Equipment required in flight consists of an accurate hack
    wattch, a sextant, and a worksheet similar to the one at right
    containing precomputed data. In flight, alternate series of course line
    and speed line celestial observations are taken."
    The manual also says, "In single place aircraft a dependable auto-pilot
    is an absolute necessity."
    (This manual is easy to find on eBay, but be careful. The 1955 edition
    is two volumes. Many sellers don't state the volume number. Celestial
    navigation is in vol. II. The 1959 edition is three volumes.)
    I filter out messages with attachments or HTML.

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=121932

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