At sea level in the International Standard Atmosphere ( ISA ) and at low speeds where air compressibility is negligible ( i . e ., assuming a constant air density ), IAS corresponds to TAS . When the air density or temperature around the aircraft differs from standard sea level conditions, IAS will no longer correspond to TAS, thus it will no longer reflect aircraft performance.
22.
Density altitude is the altitude relative to the standard atmosphere conditions ( International Standard Atmosphere ) at which the air density would be equal to the indicated air density at the place of observation, or, in other words, the height when measured in terms of the density of the air rather than the distance from the ground . " Density Altitude " is the pressure altitude adjusted for non-standard temperature.
23.
According to JBM Ballistics, using the G7 ballistic coefficient provided by Bryan Litz, the 7.62mm M118 Long Range 7.62?1mm NATO cartridge, when fired at its nominal muzzle velocity of 786 m / s ( 2, 580 ft / s ), should have approximately supersonic range under International Standard Atmosphere conditions at sea level ( air density ? = 1.225 kg / m 3 ).
24.
For a typical . 375 CheyTac chambered gun, shooting 24.30 gram ( 375 gr ) Lost River Ballistic Technologies bullets ( claimed G1 BC = 1.02 ) at 930 m / s ( 3050 ft / s ) muzzle velocity, the supersonic range would be 2230 m ( 2440 yd ) under International Standard Atmosphere sea level conditions ( air density ? = 1.225 kg / m?).
25.
According to JBM Ballistics, using drag coefficients ( C d ) provided by Lapua, the L115A3 has an approximate supersonic range ( speed of sound = 340.3 m / s ) of under International Standard Atmosphere conditions at sea level ( air density ? = 1.225 kg / m 3 ) and at the altitude or elevation ( air density ? = 1.1069 kg / m 3 ) of Musa Qala.
26.
According to JBM Ballistics, using the G7 ballistic coefficient provided by Bryan Litz, the Mk 248 MOD 1.300 Winchester Magnum cartridge, when fired at its nominal muzzle velocity of 869 m / s ( 2, 850 ft / s ), should have approximately 1, 286 m ( 1, 406 yd ) supersonic range under International Standard Atmosphere conditions at sea level ( air density ? = 1.225 kg / m 3 ).
27.
In theory, Mr . M�ller calculated that a typical . 375 CheyTac chambered gun, shooting his now defunct 26.44 gram ( 408 gr ) . 375 Viking bullets ( claimed G1 BC = 1.537 ) at 870 m / s ( 2854 ft / s ) muzzle velocity, would have a supersonic range of 3090 m ( 3380 yd ) under International Standard Atmosphere sea level conditions ( air density ? = 1.225 kg / m?).
28.
According to JBM Ballistics, using the G7 ballistic coefficient provided by Bryan Litz, and a Weapon Employment Zone ( WEZ ) analysis of the XM2010 rifle with various . 300 Winchester Magnum ammunition types by Bryan Litz, the MK 248 MOD 1.300 Winchester Magnum cartridge, when fired at its nominal muzzle velocity of 869 m / s ( 2, 850 ft / s ), should have supersonic range under International Standard Atmosphere conditions at sea level ( air density ? = 1.225 kg / m 3 ).
29.
International Standard Atmosphere hourly fuel consumption per engine is 7.7 t ( 16, 975 lb ) at maximum continuous rated thrust, 6 t / 13, 230 lb at nominal maximum thrust, 5.1 t ( 11, 243 lb ) at 85 % thrust, 4.2 t / 9260 lb at 70 %, 3.6 t ( 7, 937 lb ) at 60 %, 2.45 t ( 5, 400 lb ) at 40 % and 1 t ( 2, 205 lb ) at idle.
30.
Due to the lower practically possible muzzle velocities for a relative heavy bullet like the 19.44 g ( 300 gr ) Lapua Scenar GB528 VLD bullet it gains about extra supersonic range under International Standard Atmosphere sea level conditions ( air density ? = 1.225 kg / m 3 ) at a muzzle velocity of 837 m / s ( 2750 ft / s ) when compared to the standard 16.2 g ( 250 gr ) Lapua Scenar GB488 VLD at a muzzle velocity of 915 m / s ( 3002 ft / s ).
