Piasecki CH-21C80Piasecki CH-21CMil V-12 Helicopter77Mil V-12 HelicopterFairey Rotodyne77Fairey RotodyneSikorsky R-4B80Sikorsky R-4BPiasecki HRP-178Piasecki HRP-1McCulloch HUM-1 (MC-4)77McCulloch HUM-1 (MC-4)1956 Bell 47G801956 Bell 47GPiasecki H-21B Workhorse78Piasecki H-21B WorkhorseBrantley B-280Brantley B-2Cessna Skyhook77Cessna SkyhookBEA Sikorsky S-6180BEA Sikorsky S-61Worlds Biggest Helicopter MIL V-1280Worlds Biggest Helicopter MIL V-12Mil Mi-6 Hook77Mil Mi-6 HookSchweizer S30080Schweizer S300Sikorsky CH-37B Mojave77Sikorsky CH-37B MojaveNew York Airways Piasecki 44B77New York Airways Piasecki 44BMil Mi-10 Harke77Mil Mi-10 HarkeBrantly B-280Brantly B-2Mil Mi-1277Mil Mi-12Sikorsky HH5260Sikorsky HH52