Question about the dynamic pressure in the lifting/drag coefficients
Hi all,
The Lifting coefficient is defined by (Lifting force )/(0.5*density*Velocity^2*Area) Should I replace the denominator with (dynamic pressure * area) which dynamic pressure = Total pressure  static pressure = (Ps)*[(1+0.2*M^2)^3.51] (note: Ps= static pressure, M= mach number) but when in compressible flow, we can find that the 0.5*density*Velocity^2 is different from the dynamic pressure(which is Total pressure  static pressure = (Ps)*[(1+0.2*M^2)^3.5)1] I am confused about which denominator should I use in Lifting/Drag coefficients. The 0.5*density*Velocity^2*Area or (PtPs)*Area ?:confused: Thanks 
The first one.

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