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Builder:
  Joseph A Nelsen
Location:
  Gunter, Tx - USA
Aircraft:
  NELSEN SONEX
Total Build Hours:
  1347
Web Site:
  http://www.mykitlog.com/JosephNelsen/

Date:  10-14-2017
Number of Hours:  4.00
Short Description:  pitot/static woes

To start off, the ASI is almost dead accurate above about 70mph relative to GPS, no wind, but without altitude and density compensation (I forgot about these items), but shows about 7-10 mph slow below 70 mph, and on the bottom peg durring stalls, which I do not like. I need to be accurate at the low end at least! I do have an AOA/LRI installed (home made) and have it set very conservatively until I can finalize the pitot/static fix.

These pix shows what I have done as a start, to see what happens.

1) since the pitot tube originally was some 8, or so, inches aft of the LE of the wing, I made a simple extension to place its opening about 1 inch ahead of the LE

2) Close up of the upper pitot tube with the extension slid over the existing tube after sizing the extension for a tight slip fit.
Also, with the idea that most static ports reside on the fusalauge side, and therby have only side holes, I have blocked off the top and bottom holes that are on the original plans built static tube. My thouights are that at high angle of attack the static port on the bottom sees too much pressure and causes the ASI, as well as the ALT, problems. I am not worried about the ALT as much as the ASI. Further, to smoothe the air passing the now side only ports, I have pointed the otherwise blunt end of the tube to attempt to remove any turbulation near those ports with a highAOA, as durring stalls, slow flight and approaches to landing where accurate speed control is very necessary.

3) Just showing the exact lengthening of the pitot tube




pitot extension





static mod





nine inches

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