WWII Engine Boost Units

Discussion in 'Aviation' started by GregP, Jun 10, 2013.

  1. GregP

    GregP Well-Known Member

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    There have been several people in here who have expressed some doubt about conversion among American, British, German, and Russian engine boost. I thought I’d address that.

    The U.S.A. used inches of Mercury (in. Hg). The British used pounds (per square inch) of boost. The Germans used technical atmospheres. The Japanese used millimeters of Mercury. I have no idea why they used different units and don’t care. The problem is converting among them.

    Since I am from the U.S.A., I’ll reference inches of Mercury, but the equations are easily manipulated to reference other units.

    1) The U.S.A. uses inches of Mercury (in Hg).

    2) British psi of boost (lbs Boost) = [(14.696/29.92) * in Hg] – 14.696

    3) German Technical Atmospheres (ata) = (in Hg) / 28.958

    4) Japanese mm Mercury (mm Hg) = (in Hg – 29.92) * (760 / 29.92)

    If anyone is interested, I have an Excel spreadsheet that computes all the others from any of them that I can forward or post ... but I can't seem to post an Excel file ... the "manage attachments" button doesn't seem to work for me. Neither does the "Attachments" button.
     
  2. krieghund

    krieghund Member

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    #2 krieghund, Jun 10, 2013
    Last edited: Jun 10, 2013

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  3. tomo pauk

    tomo pauk Creator of Interesting Threads

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    Hi, Greg, maybe you might want to zip the Excel file, and then post it?
     
  4. altsym

    altsym Member

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    Would love to have that chart!
     
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