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Message: <blockquote data-quote="aeroengineer1" data-source="post: 179213" data-attributes="member: 1120">The photo above of the sub in a wind tunnel is a photo of an LA class (flight 1-flight 4, not a 5 or 6) in the NASA Langley National Transonic Facility (hence the NTF in the picture).  There is a circular pressure rake at the stern.  From what I understand, this model was if not the largest, one of the largest models to go into that tunnel.  It is a unique tunnel in that it is a cryogenic tunnel and can simulate velocities up to the Mach 1 region.  It allows for simulation of high Re numbers better than most other tunnels.  To those that are wondering why I indicated that there are up to 6 flights of the LA class, not the typical 3, this is due to the fact that people, including some public military documents indicate that there are 3 flights or major hull configurations.  My friend, who has served on the LA boats as well as later working maintenance has indicated to me that for maintenance purposes, there are 6 officially designated flights.  Most of the differences are internal. Adam</blockquote>