Two large rotors are responsible for the vehicle's propulsion.

Hughes XH-17 - flying crane (largest rotor of any type on a helicopter)

The larger rotor and engine giving it a 45% performance increase over previous 269-models.

The aircraft did not have conventional wings, and instead featured a large rotor.

This is the chief concern of engineers who design large rotors.

The adoption of three rotors was due to concerns over the capability of a single large rotor to generate the required lift.

Feed me some more nice large rotors like this and I will soon replace the loss, and finish all the rest too.

Disadvantages of the tandem-rotor system are a complex transmission, and the need for two large rotors.

With large rotors to dissipate heat, disc brakes are becoming more popular as drag brakes.

The braking system included larger front rotors and cross-drilling all around.