Kiel Tube

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by dino, Feb 14, 2020.

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  1. Feb 14, 2020 #1

    dino

    dino

    dino

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    pitot tube.jpg I'm making a Kiel Tube pitot source to be built into the fairing on the nose of a gyroplane. So far I've got a 32mm ID X 75mm grp tube sealed flush on the inside end and open to the free stream on the other. My question is what is the best way to position the (6mm OD X 4mm ID copper tube) ASI pickup within the tube? Some sources show it about at about the geometric center of the tube pointing forward while others have it centered, at the forward lip.
     
    Last edited: Feb 14, 2020
  2. Feb 15, 2020 #2

    TiPi

    TiPi

    TiPi

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    check out some of the earlier gliders. I remember on the ASK-13 and the Ka-8 we checked the ASI by pressing the flat hand against the tube in the nose. From memory, there was no tube inside the approx 20-25mm tube in the nose. Your drawing above might give you false readings as the airstream diverts over the nose and there might be a lower pressure at your smaller tube than the actual dynamic pressure. I would cut it flush with the wall of the larger tube as that will have the dynamic pressure. The old gliders did have the tube protruding slightly from the nose though.
    upload_2020-2-15_11-56-25.png upload_2020-2-15_12-0-35.png
     
  3. Feb 15, 2020 #3

    dino

    dino

    dino

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    The drawing is from the BJ 1 Duster. In the wooden gliders this is what I remember too. I've seen many of the composite sailplanes with the ASI pick up recessed deeper in the tube but I don't recall specifics
     

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