Boeing X-48 instance of aircraft model
The Boeing X-48 is an American experimental unmanned aerial vehicle (UAV) built to investigate the characteristics of blended wing body (BWB) aircraft.  Boeing designed the X-48 and two examples were built by Cranfield Aerospace in the UK.  Boeing began flight testing the X-48B version for NASA in 2007. The X-48B was later modified into the X-48C version, which was flight tested from August 2012 to April 2013.  Boeing and NASA plan to develop a larger BWB demonstrator.
type of example of manifestation of representation of