Keywords: S-49 R-6A HoverflyII.jpg en Sikorsky R-6A Hoverfly II helicopter de Ein Sikorksy R-6A Hoverfly II Hubschrauber U S Air Force photo http //www nationalmuseum af mil/shared/media/photodb/photos/091016-F-1234S-002 jpg 091016-F-1234S-002 from http //www nationalmuseum af mil/factsheets/factsheet asp id 523 USAF museum website author date PD-USGov Sikorsky R-6 |