main rotor

The effect was to swap those letters before and after the main rotor scrambling unit.

It is a development of the Bell 212 with the major difference being the composite four-blade main rotor.

Most research is now directed towards reducing the noise from the main and tail rotors.

The main rotor and transmission system of the R-4 was retained.

This also resulted in the main rotor being mounted very close to the cabin roof.

In theory, with the props cut, they should have slowed his fall the same way the main rotor did on a helicopter.

Helicopters have several different configurations of one or more main rotors.

If before, it could have slowed the main rotor, he said.

As it prepared to land, the main rotor was struck by enemy gunfire.

The French make their main rotors turn clockwise when viewed from above.