Airport Engineering
The slope of the obstruction clearance line from the boundary of the heliport should be

0.069444444444444
0.045138888888889
0.047222222222222
0.043055555555556

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Airport Engineering
Speed of

Sound varies 2.4 kmph per degree centigrade rise in temperature
All listed here
Sound at 0°C is called one Mach
Sound at 0°C is 1190 kmph

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