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Knots tied at a distance of 47 feet 3 inches (14.4018 m) from each other, passed through a sailor's fingers, while another sailor used a 30-second sand-glass (28-second sand-glass is the currently accepted timing) to time the operation. [9]
An aircraft's indicated airspeed in knots is typically abbreviated KIAS for "Knots-Indicated Air Speed" (vs. KCAS for calibrated airspeed and KTAS for true airspeed). The IAS is an important value for the pilot because it is the indicated speeds which are specified in the aircraft flight manual for such important performance values as the stall ...
An airspeed indicator for an aeroplane. Indicated airspeed is displayed on the black background (in this case both in knots (kn) and miles per hour (mph)). The pilot sets the pressure altitude and air temperature in the top window using the knob. Based on that, the white background scale in the lower left window moves to give true airspeed.
Many ships used knots spaced 8 fathoms (48 feet or 14.6 meters) apart, while other ships used the 7-fathom prescription. [8] The time interval needs to be adjusted according to the distance between knots. Substituting 6,000 feet for 1 mile, the above formula yields 28.8 seconds for a distance of 8 fathoms.
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[39] [40] At 16:08:30 Flight 548 began its take-off run, which lasted forty-four seconds, the aircraft leaving the ground at an indicated airspeed (IAS) of 145 knots (269 km/h; 167 mph). The safe climb speed ( V2 ) of 152 knots (282 km/h; 175 mph) was reached quickly, and the undercarriage was retracted. [ 38 ]
Captain Avery stated that the crew would stop trimming the aircraft at 184 knots (212 mph; 341 km/h) and that the stall speed (V S) was 122 knots (140 mph; 226 km/h). Flight engineer Waelti stated that the stick shaker would activate at 128 knots (147 mph; 237 km/h), which was 6 knots (6.9 mph; 11 km/h) higher than the calculated stall speed.