Experimenter

October 2012

Experimenter is a magazine created by EAA for people who build airplanes. We will report on amateur-built aircraft as well as ultralights and other light aircraft.

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ambient pressure, but the static port should be located such that it senses only ambient or static pressure. This is why the static port is located where its opening is perpendicular to the relative wind. Different flight conditions and land- ing gear and flap positions can cause the air pressure around the static port to vary. Because your airspeed indicator compares the pressure from the pitot tube with the static pressure, any variation in sensed static pressure can cause erroneous airspeed indications. The only way to determine these errors is through flight testing. Because your airspeed indicator compares the pressure from the pitot tube with the static pressure, any variation in sensed static pressure can cause erroneous airspeed indications. We'll discuss flight-test methods next month, but for now we'll just make the point that calibrated airspeed is indicated airspeed corrected for errors stemming from the pressure variations around the static port. Note: Certified airplane manufacturers perform extensive testing to find a static source loca- tion or position on their airplanes where this variation is minimal. That's why this indicated-to-cal- ibrated correction is often called position error correction or instal- lation error correction. Calibrated and Equivalent Airspeed Equivalent airspeed is calibrated airspeed corrected for compress- Figure 1 EAA EXPERIMENTER 45

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