Mach Crit
Hi guys,
thank you for your reply and efforts. I actually meant the critical Mach number of the 747 airfoil. This was in the context of swept wings. I read through some notes about calculating the swept wing critical Mach number by dividing the critical Mach number of the straight airfoil by the cosine of the sweep (37,5 in case of the 747). As the given example used 0,7 Mach crit for the straight airfoil and 30 degrees sweep, the resultant critical Mach number was 0,81 Mach. Since the 747 is designed to already cruise at 0.86 Mach, I was wondering what the official critical Mach number for that airplane is.
Nevertheless, I admit that the scenario I mentioned is pretty academic and Mach crit appears to be of little operational value compared to MMO.
Last edited by tornadoflyer; 18th Dec 2005 at 07:40.