Talk:Drag-divergence Mach number

Formal Definiton
I understand that drag divergence mach number is defined as the Mach number at which the derivative of the Drag coefficient with respect to the Mach number = 0.1. Is this correct?

81.76.120.87 (talk) 11:04, 9 January 2008 (UTC)

I took four semesters of aerodynamics in college, I haven't heard of that before. I would be surprised if it can even be formalized like that, because the derivative of Cd with Mach number is also a function of the reference area, which is arbitrarily defined by the user. MarcusMaximus (talk) 02:43, 22 June 2008 (UTC)