L’hélicoptère hybride Sikorsky-Boeing SB-1 « DEFIANT »

Posted on 02/04/2019

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Premier vol

http://psk.blog.24heures.ch/archive/2019/03/24/vol-inaugural-pour-le-sb-1-defiant.html

https://www.lockheedmartin.com/en-us/products/sb1-defiant-technology-demonstrator.html