Smooth Ball, Bald (No Felt) and Standard Tennis Ball - Tunnel Set-Up

NASA's Kent Shiffer Measures the Tare in the Tunnel - The Bald Tennis Ball is in the Tunnel

Setting Up the Tunnel - Notice the Airfoil (Airplane Wing Shaped) Strut - The Tennis Ball Will Attach to the Strut

The Strut is an Airfoil (Wing) Shape Not a Cylinder Shaped Rod - The Airfoil Shape Has Less Drag Than A Rod

The Load Cell Located Underneath the Strut - The Load Cell Measures the Drag Force on in the Tunnel

Load Cell From a Different View