Im doing research on skydiving and I am trying to find out how much drag is created on different jumps. I have different velocities for each of the jumps. D = Cd ((rV^2)/2)A That is the equation I am using. r is air density which im using 1.2 kg/m^3. V is the velocity. And ive measured the skydivers approximate area (A) to be .871 square meters. How do I find Cd (Drag coefficient)? Is this a constant? Is there somewhere I can get some more information on what Cd would be? Thanks!