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  • Identification help

    Good day Community!

    I get this propeller from a friend.
    I like to know the for which plane this propeller was used.
    After some hours searching the Net I found the marvelous adress from this forum.
    Please be so Kind and help me to verify this prop.
    On the type lavel is following:
    J.H.Schäfer & Co
    Bremen
    Abt.Luftschrauben
    Baugr.Nr. 9-50001.11
    Werk.Nr. 51.2947

    Lengh from Tip to tip 230 cm ( 90,55 inch)
    Number of bolt holes 3 ( additional I can see 3 marks, coming from 3 additional holes at the propellerboss)


    Hope for a positive answet

    Many thanks

    Kind regards

    Gerald
    Attached Files

  • #2
    Three bolt holes? I haven't seen any aircraft hubs with just 3. Are you saying that it looks as if it was drilled for three but marked for 6?

    I don't have any references that list those numbers. Maybe Bob Gardner will know. It's general appearance suggests a post WW1 usage, perhaps even WW2 era or some time in between, but that's only a guess.

    Comment


    • #3
      Identification help

      Many thanks for your reply,
      The three holes are not going through the Propeller, the hole is only two inches deep, the total thickness is 11,7 cm ( 4,6 inch).
      I guess, this are only for torque, the prop fixation must be in the center.
      I will trial to add some more pictures, but not shure if I can do.
      Attached Files

      Comment


      • #4
        Identification help

        The file size was to big, I will post now one picture and a second later

        Kind regards

        Gerald
        Attached Files

        Comment


        • #5
          Identification help

          This is the prop from the other side
          Attached Files

          Comment


          • #6
            Gerald,

            The three blind holes are for a Rupp quick release fastener, which dates your propeller to the 1920's or early 1930s. Most Rupp hubs had four stud holes; some, for the most powerful engines, six. The black covering of the prop and the style of the data plate also both suggest a prop from the 1920's.

            Propellers fitted for Rupp hubs are extremely rare; those few in captivity have four stud holes. I only know of one other propeller with three stud holes, which is in a German Museum.

            Sadly the rarity of your propeller is not reflected in its value, because only a few people know anything about them, and some of those have forgotten!

            Nonetheless, you are now the curator of a very rare propeller. Take care of it for the future generations to come.

            With kind regards,

            Bob
            Bob Gardner
            Author; WW1 British Propellers, WWI German Propellers
            http://www.aeroclocks.com

            Comment


            • #7
              Bob,

              Many thank' for your revealing feedback.
              I will deal with the propeller very carefull.
              I get another very interesting information from my friend.
              The former owner of this prop was Theo Blaich, I guess you know him.
              Theo Blaich was the owner of a Bf 108, this plane has a Argus 10 c engine, is it possible that the Bf 108 has such a Propeller.

              Kind regards

              Gerald

              Comment


              • #8
                Gerald,

                Bob is away for a week or two so won't be responding during that time.

                Dave Bahnson

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