Transportation:Building the Ultimate — Helicopter
The helicopter is the only machine effective to take off vertically and hover. It’s the hover that makes the helicopter different. From search and rescue to attack， technology pushing the helicopter to perfection. To maintain this unique position it must constantly reinvent itself and engineers are taking its design even further. Experimenting with new technology， this is the challenge they face as they strive to fill the ultimate.
- Added：2006
- Country：America
- Duration：30
- Time of update：2011/8/22 11:22:31