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How to Install the Pitot Tube in a QB Wing

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  • How to Install the Pitot Tube in a QB Wing

    I am reluctant to just start cutting holes in the Leading Edge of the Wing. Sooo I thought I would ask for advice from builders how they installed their pitot tubes. It looks like it ought to go in the area where the lift strut comes into the wing. Thx. Rolly Clark

  • #2
    The idea is to keep it out of the prop wash and flap disturbance areas. Otherwise put it where you will have access to install / remove / inspect. Mine is in the outboard bay, others have put it in the bay just outboard of the strut attach with good results.

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    • #3
      Something I saw, albeit on a Kitfox IV, on pitot placement was locating it ahead of, and near the strut attachment point.
      The thinking behind this was so that the strut would provide some protection to the tube as people walked around and under the wing.
      John Massaro
      Plans Building LSA - 091
      Arizona

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      • #4
        Here is how I did mine on the Patrol QB
        http://mybearhawkpatrol.com/wings/pitot.html


        Eric Newton
        Bearhawk Tailwheels LLC
        Http://bhtailwheels.com
        Bearhawk Builder Manuals
        Http://mybearhawk.com
        Eric Newton - Long Beach, MS
        Bearhawk Tailwheels and Builder's Manuals
        http://bhtailwheels.com
        http://mybearhawk.com/buildermanual.html

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        • #5
          Thanks to all, and to Eric for the great fotos and parts list. RC

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          • #6
            Eric, I noticed your pitot tube looked to extend about 12" past the leading edge. Is there a minimum length for that? Is there any aeronautical principle that requires a minimum distance from the leading edge? Maybe for "clean" air?

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            • #7
              Originally posted by Zzz View Post
              Eric, I noticed your pitot tube looked to extend about 12" past the leading edge. Is there a minimum length for that? Is there any aeronautical principle that requires a minimum distance from the leading edge? Maybe for "clean" air?
              At low speed air is incompressible, so provided it's clear of the higher pressure area around the LE, there should be no problems I'd have guessed. Lots of gliders I see have quite short pitot tubes, often bent to sh*t too. Still seem to work just fine provided the front still points forwards.

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              • #8

                Originally posted by Zzz
                Eric, I noticed your pitot tube looked to extend about 12" past the leading edge. Is there a minimum length for that? Is there any aeronautical principle that requires a minimum distance from the leading edge? Maybe for "clean" air?
                Yes - a previous builder who was an engineer type had said a long time ago that 18" was ideal - but o went with 12" and mine seems to be accurate. It has to do with air building up at slow speeds and high angle of attack.


                Eric Newton - Long Beach, MS
                Bearhawk Tailwheels LLC
                Bearhawk Manuals
                http://mybearhawk.com
                Eric Newton - Long Beach, MS
                Bearhawk Tailwheels and Builder's Manuals
                http://bhtailwheels.com
                http://mybearhawk.com/buildermanual.html

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                • #9
                  Dynon boom type recommends 18" for the same reasons. Seemed like a lot to me but works well.

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