Sikorsky S-72 Rotor Systems Research Aircraft (RSRA) 1978 NASA Langley Research Center; JQ Music

more at: http://scitech.quickfound.net/aviation_news_and_search.html “A 1978 video of the Sikorsky S-72 experimental hybrid helicopter/fixed-wing aircraft. The test aircraft had a basic helicopter fuselage with the wings and lower horizontal all-flying stabilizer installed.” Public domain film from the US National Archives, slightly…