Speed Air
How does the True Air Speed calculated in the aircraft?
Using the E6B flight computer..
TRUE AIRSPEED AND DENSITY ALTITUDE
1. Air density affects the indications of the airspeed indicator and the performance of the airplane.
1. Density altitude is the theoretical altitude in the standard atmosphere where the density is the same as the actual density you are experiencing in flight.
1. Density altitude is found by correcting pressure altitude for nonstandard temperature.
2. Pressure altitude can be determined by setting the airplane’s altimeter to 29.92 and then reading the altitude.
1. If this is done in flight, make a note of the altimeter setting before turning it to 29.92.
2. After you determine the pressure altitude, reset the altimeter to the current setting.
3. The outside air temperature (OAT) can be determined by reading the current temperature on the airplane’s OAT gauge.
1. You will need to use the Celsius scale.
2. True airspeed (TAS) is the actual speed of the airplane through the air.
1. TAS is found by correcting calibrated airspeed (CAS) for density altitude.
2. See your airplane’s Pilot’s Operating Handbook to determine CAS based on indicated airspeed.
1. Generally, there is little error at cruise speeds; i.e., CAS equals indicated airspeed (IAS).
2. Thus, as a practical matter, you may usually use IAS rather than CAS to determine true airspeed.
2. Determining True Airspeed and Density Altitude
1. True airspeed and density altitude can be calculated on the calculator side of your flight computer.
2. Rotate the inner scale until the numbers on the inner and outer scales match.
1. The window that is between “1:30″ and “1:50″ on the hour scale is labeled “DENSITY ALTITUDE” and the arrow points to the density altitude.
1. The numbers that rotate through this window are in thousands of feet and range from -10 (or -10,000 ft.) to 45 (or +45,000 ft.).
2. The window on the right side below “2:00″ and “2:30″ on the hour scale is used to set the OAT (above the window) over the pressure altitude (numbers in the window).
1. The OAT is in 5°C increments from +50°C on the left side to -70°C on the right side.
2. The numbers in the window are in thousands of feet and range from -2 (or -2,000 ft.) to 50 (or 50,000 ft.).
3. EXAMPLE: What is the TAS and density altitude if the IAS is 130 kt., OAT is -15°C, and the pressure altitude is 5,000 ft.?
1. Using the inner window on the right side, locate the OAT of -15°C and rotate the disk so the pressure altitude of 5,000 ft. (which is labeled “5″ on the scale) is under -15°C, as shown in the figure.
2. In the window labeled “DENSITY ALTITUDE,” read the density altitude of approximately 2,500 ft.
3. Locate the IAS of 130 kt., or “13,” on the inner scale. Without moving the disk, read the TAS on the outer scale opposite the IAS, which is 135 kt
AIR SPEED FOOT WEAR WOULD LIKE TO WELCOME NATE SHERWOOD.
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