FSX Sikorsky S-55 / Whirlwind flight2000it 15 years ago FSX Sikorsky S-55 / Whirlwind. Another batch of freeware models by Alphasim. Includes two models and six texture sets. Complete cockpit with 2D panel/gauges and VC. 15 Mb FSX – Sikorsky S-39B AmphibianFSX/P3D v4 – Sikorsky S-92AFSX – Sikorsky VS-44 Flying Boat