I think the drag coefficient as a derivation of drag peaks around supersonic speed but I am not sure about it. https://aviation.stackexchange.com/questions/797

I think the drag coefficient as a derivation of drag peaks around supersonic speed but I am not sure about it. https://aviation.stackexchange.com/questions/79732/why-does-drag-coefficient-decrease-with-mach-number-in-the-supersonic-regime https://aviation.stackexchange.com/questions/79732/why-does-... Not sure what zero lift means in this context, perhaps the drag induced by lift is neglected. It is still > 0 so drag does still increase...