air speed


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air speed

The speed of an aircraft relative to its surrounding air mass. The term air speed can mean any one of the following: indicated air speed, calibrated air speed, equivalent air speed, and true air speed. Indicated air speed or IAS is the uncorrected reading obtained from the air speed indicator. This is the speed used in pilot/controller communications under the general term air speed. Calibrated air speed, or CAS, is the aircraft relative to its surrounding air mass. Equivalent air speed, or EAS, is the calibrated air speed corrected for compressibility-of-air error. True air speed, or TAS, is the equivalent air speed corrected for density altitude (i.e., variation in pressure and temperature). True air speed is used in flight planning and the en route portion of flight. True air speed is not shortened to “air speed” in pilot/controller communications.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The applicator must adjust factors to achieve a very coarse spray, considering that air speed and spray pressure control droplet size and spectrum classification.
The effects of air speed and the ambient temperature on the crystallization process ar e also studied.
When conveying abrasives, one study showed an elbow can last nearly 17 times longer when air speed is 35 mph versus 75 mph, and in this range, elbow life nearly doubled for every 10 mph decrease in speed.
Table 4 presents the parameters, coefficients of determination (R2) and mean square deviations (MSD) of the models Approximation of Diffusion, Two Terms, Henderson & Pabis and Page fitted to the experimental drying data of yacon cylinders, at air speed of 2.0 m [s.sup.-1] and drying air temperatures of 50, 60 and 70 [degrees]C.
Simulation parameters were set to correspond closely with the measured ambient conditions and FFUs air speed at the HDD factory at the time that the contamination had happened.
4, 5 and 6 for the air speed of 5, 10 and 20 m/s, respectively.
Air speed provided by Fan 1 falls below 125 fpm (0.64 m/s) at approximately 95 ft (29 m) from the center of the fan.
Even while increasing air speed, redesigned nozzles reduce air eddies to make the new model quieter than any previous model, which were noted for quietness.
Additional considerations are air speed and hood design.
The mean air speed was calculated from mean air velocity and turbulent kinetic energy using a correction formula reported by Koskela et al.
House A failed to meet this criteria for heating season when temperatures are set below 22.5 [degrees]C (72.5 [degrees]F) due to a maximum cyclic air speed of 0.24 m/s (0.79 f/s) as shown in Figure 2.