| 1. | It of course, can not mount a shroud over its main rotor.
|
| 2. | The main rotor transmission uses a combination of V-belts and toothed belts.
|
| 3. | One modification for the S-61 is the Carson Composite Main Rotor blade.
|
| 4. | The main rotor shaft was able to tilt slightly for forward control.
|
| 5. | Controls vary the pitch of the main rotor blades cyclically throughout rotation.
|
| 6. | First, there is no tail rotor, and the main rotors are contra-rotating.
|
| 7. | It directly led to a mid-air seizure of the main rotor blades.
|
| 8. | Tandem rotors are two horizontal main rotor assemblies mounted one behind the other.
|
| 9. | Helicopters have several different configurations of one or more main rotors.
|
| 10. | As it prepared to land, the main rotor was struck by enemy gunfire.
|