Last modified on 7 August 2014, at 15:47

Category:Sikorsky S-69

English: The Sikorsky S-69 was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program in the 1970ies.

Media in category "Sikorsky S-69"

The following 3 files are in this category, out of 3 total.