X-Plane 10 Sikorsky S-64 v1.0. This is one of the biggest helicopters in the world. If you want to pick up really heavy cargo, this machine is the perfect choice. This project looked easy at first, but soon turned into a real challange. The file contain two versions. The first one is with the cargo container, and the second one is ready for the slung load. By Radek Kovarik.