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Finding drag force and coefficients without a wind tunnel using excel

I created this video to help others understand how the drag coefficient can be found without a wind tunnel and using a program like excel to help match modeled data to real data to find the correct drag coefficient (Cd). Cd is usually found by rearranging the drag force equation and just solving quickly for the Cd. Drag force is found by hundreds of wind tunnel tests, but what if you dont have a wind tunnel? its very difficult to find a value for Cd without knowing the drag force, but it can be done.