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Propeller ID: 3.7m diameter 4-blader

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  • Propeller ID: 3.7m diameter 4-blader

    Hi Everyone,

    I'm trying to identify possible aircraft for a cut-down four-blader that has been sanded and revarnished (not by me) which make the hub stampings very difficult to read, but appear as follows:

    AD 555
    LEFT HAND
    75HP RENAULT
    D3744 P2680

    The 75HP Renault does not appear to have been a widely-used engine, with scarce references mostly focussed on 70HP and 80HP Renault engines.

    At 3.744 metres, it would have been a very impressive prop. Such a shame it's been cut down.

    Any thoughts? I've attached a photo of the hub stampings. Unfortunately I don't have anything else to go on.

    Cheers,

    Jason
    Attached Files
    Jason Gehrke, Brisbane, Australia

  • #2
    "AD555" was a two bladed prop used for a Clerget engine, so that doesn't fit. I can't really read the stamped numbers. There is a listing for "AD 532" which is a left hand tractor 4-blade with a Renault 75HP engine for the BE2c. At this point I'm guessing that's the most likely match, although I don't have the data for the diameter and pitch on that model to see if it matches yours.

    Stamped horsepower often doesn't match exactly what is now listed as horsepower for a specific engine.

    Comment


    • #3
      Hello Jason,

      Good to hear from you again!

      Another possible interpretation of the remains of the markings on your hub is:
      AD535
      D2744
      P2600

      These data are for a Standard Prop (ie; authorised by the Air Board) for a 75hp Renault engine for the early BE2C.

      AD indicates that it was originally a design of the Air Department of the RNAS, but still extant in the 1918 list of Air Board numbers that I have.

      With kind regards,

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

      Comment


      • #4
        Thanks Dave and Bob. Hope you're both well.

        You could be right about it being 2.744m rather than 3.744m Bob, in which case a BE2c is a perfect fit. A four-blader that big would be extraordinary. It's just so difficult to read the stampings.

        I really appreciate your insights and expertise.

        Cheers,

        Jason
        Jason Gehrke, Brisbane, Australia

        Comment


        • #5
          I'm delighted to be of help, particularly to an Australian, and even to an American!

          With kind regards,

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

          Comment


          • #6
            Jason,

            Remind me, for I grow ever more slow of brain. Did I send you a complete set of my books recently?

            Were they up to scratch?

            With kind regards,

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

            Comment


            • #7
              Originally posted by Bob Gardner View Post

              Another possible interpretation of the remains of the markings on your hub is:
              AD535
              D2744
              P2600

              These data are for a Standard Prop (ie; authorised by the Air Board) for a 75hp Renault engine for the early BE2C.

              AD indicates that it was originally a design of the Air Department of the RNAS, but still extant in the 1918 list of Air Board numbers that I have.

              With kind regards,

              Bob
              Bob, do you mean AD 532? I have that listed as a 4-blade LHT for a Renault, but I have AD 535 listed for a Fiat engine.

              Comment


              • #8
                Greetings Dave,

                Confusingly there are two entries for AD532 in the Air Board list of 1918 that I use.

                Firstly, AD532 for a 75hp Renault for the BE2C aircraft. This is not listed as a Standard Prop

                Secondly, AD532 is also listed for a 250hp FIAT fitted to the front nacelle of a R23 RN Airship.

                Neither listing shows any dimensions, nor are they listed as Standard props. I assume this is a clerical error by an Air Board clerk, who may perhaps have been day-dreaming about his girl friend etc.

                The drg number AD535 is much more convincing.

                With kind regards,

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

                Comment


                • #9
                  Hi Bob,

                  Nothing wrong with your memory.

                  Yes, I did buy a set of books from you recently - I think I now have all of your propellor books. They are a great reference.

                  Cheers,

                  Jason
                  Jason Gehrke, Brisbane, Australia

                  Comment


                  • #10
                    Thanks Jason,

                    Now that you have the reference books we can enrol you as a forum expert!

                    With kind regards,

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

                    Comment

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