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Old 7th Feb 2019, 10:50
  #175 (permalink)  
Join Date: Feb 2006
Location: The Alps
Posts: 2,075
1978 Technical Report

Looks like the answer lies as far back as 4 decades ....

Origins Of Stealth Black Hawks Date Back Over 30 Years Before The Bin Laden Raid - The Drive

intersting report dated as far back to 1978 titles ‘Structural Concepts And Aerodynamic Analysis For Low Radar Cross Section (LRCS) Fuselage Configurations’

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