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EARLY A.S.I ?

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  • sopwith.7f1
    Rank 5 Registered User
    • Jan 2011
    • 1142

    EARLY A.S.I ?

    I recently acquired this airspeed indicator, it appears to be based on a MK V asi, but there are no military markings on it.
    Can any one shed some light on exactly what type it is etc ?.

    Cheer's.
    Bob T.
    Attached Files
  • Avro Avian
    Rank 5 Registered User
    • Jan 2010
    • 587

    #2
    Airship perhaps? Only thing I can think of with a speed range that slow.
    Last edited by Avro Avian; 23rd April 2012, 12:33.

    Comment

    • aircraftclocks
      Rank 5 Registered User
      • Sep 2006
      • 317

      #3
      What is the serial number of this instrument?

      Comment

      • aeronut 2008
        Rank 5 Registered User
        • Jan 2008
        • 1565

        #4
        Could it be from a Met Office or Control tower?

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        • aeronut 2008
          Rank 5 Registered User
          • Jan 2008
          • 1565

          #5
          Forget that, it says Air Speed not Wind speed.

          It would be more than acceptable in something like a Slingsby T21 though.

          Comment

          • ericmunk
            Rank 5 Registered User
            • Apr 2009
            • 1735

            #6
            Originally posted by aeronut 2008 View Post
            It would be more than acceptable in something like a Slingsby T21 though.
            No. Vne in a T.21b is 92 knots, off the scale.

            Comment

            • aeronut 2008
              Rank 5 Registered User
              • Jan 2008
              • 1565

              #7
              Can you point a T21 vertically downwards for long enough to reach 92 knots?

              I last flew one 32 years ago but is I recall correctly the stall was arond 28 kt and you flew the circuit at 32kt and the approach at 35kt.

              Comment

              • sopwith.7f1
                Rank 5 Registered User
                • Jan 2011
                • 1142

                #8
                Originally posted by aircraftclocks View Post
                What is the serial number of this instrument?
                The serial number is- 39896.

                It is calibrated for use with an A.R.L spherical pressure head .

                Bob T.

                Comment

                • CeBro
                  Rank 5 Registered User
                  • Sep 2009
                  • 2146

                  #9
                  Halifax Mk I

                  Only joking of course.

                  Cees

                  Comment

                  • ericmunk
                    Rank 5 Registered User
                    • Apr 2009
                    • 1735

                    #10
                    Originally posted by aeronut 2008 View Post
                    Can you point a T21 vertically downwards for long enough to reach 92 knots?
                    Yes. Wear goggles, though.

                    Comment

                    • sopwith.7f1
                      Rank 5 Registered User
                      • Jan 2011
                      • 1142

                      #11
                      Originally posted by CeBro View Post
                      Halifax Mk I

                      Only joking of course.

                      Cees
                      I know the one you are on about, it was a secret prototype that was built to test the possibility of using a number of surplus WW1 parts, of which there was still a large stock remaining in WW2. It was fitted with 4 Bentley rotary engines, & DH10 outer wing panels etc. Apparently it was not put into production due to the gyroscopic affects of the rotary engines, making it a bit twitchy to fly .

                      Bob T.

                      Comment

                      • sopwith.7f1
                        Rank 5 Registered User
                        • Jan 2011
                        • 1142

                        #12
                        Originally posted by ericmunk View Post
                        Yes. Wear goggles, though.
                        & write out your last will & testicle :diablo:.

                        Comment

                        • ericmunk
                          Rank 5 Registered User
                          • Apr 2009
                          • 1735

                          #13
                          Originally posted by sopwith.7f1 View Post
                          & write out your last will & testicle :diablo:.
                          It's not that bad actually:

                          http://thermiekfotowedstrijd.nl/albu...e.php?pid=1010

                          (though this is cheating: it's a Prefect in a vertical dive, as our T21 is not flying yet)

                          Comment

                          • pogno
                            Rank 5 Registered User
                            • Dec 2005
                            • 1182

                            #14
                            This might be a complete red herring but A.R.L could refer to the Aeronautical Research Laboratory of Australia http://www.eoas.info/biogs/A000309b.htm

                            The spherical pressure head refers to the design of the pitot head where the tip of it was a rounded shape based on sciantific work by Ludwig Prandtl.

                            This doesnt answer what the application would have been.

                            Richard
                            "Where are you from?"
                            "America" Somebody laughed politely.

                            Comment

                            • Air Ministry
                              Rank 5 Registered User
                              • Jan 2008
                              • 1695

                              #15
                              Came across this the other day Bob and thought of you....

                              70 knots = 80.6 m.p.h.
                              Attached Files
                              The garage that keeps on giving.

                              Comment

                              • sopwith.7f1
                                Rank 5 Registered User
                                • Jan 2011
                                • 1142

                                #16
                                Hi Alan

                                Thanks for the info, it's supprising what stuff is still turning up.

                                Bob T.

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