Basic Flight Aerodynamics ( PART -8 )

Critical Mach Number :  When the airflow  is in subsonic range, mach number will be near by  1.0 , approximate 0.8 - 0.9 ( where airflow speed is so high ).

Speed Of Sound : Speed of sound always follows on temperature .The speed of sound drops by approximately 45 m/s. Considering Temperature & height, speed of sound are different.



      Height (km)    Temperature (dk)      Speed of sound(m/s)

    Sea level                    288                           340.3
    
      3.0                            269                           328.6

      6.0                            249                           316.5

      9.0                            230                           304.0

    12.0                            217                           295.0