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Air speed and pitot tube location

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kpin

kpin

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My airspeed is questionable. The difference between the front and rear indicator is 10 MHP. The difference between the GPS and rear indicator is significant at cruise. I also have noticed that on run up, while standing still, I will get a 40 MPH indication on the airspeed indicator. Is this common? Shouldn't the ram air be outside of the propwash?


Ken
 
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