ECN-9810 Close up of the 10 degree cone attached to the nose of the F-15A. The aircraft record in-flight data, while an identical cone was also tested in wind tunnels. The difference from the ''real world'' flight data and the data from the simulated conditions in the wind tunnels was then used to calibrate the data from the wind tunnels. August 1978 NASA Photo / Bob Rhine & F-15A Project Description
