His eyes went outboard again, seeing only snowflakes being churned by the downwash of the rotor tips.

She was tilting backwards, pitching dangerously, until Hob feared for the rotor tips.

Thus multiple engines would be needed at the base as well as at the rotor tips.

Attempts have even been made to mount engines directly on the rotor tips.

Its rotor tips touched the beach and flew apart, then the body of the machine crashed down flat on its skids.

The traditional low-tech system is to mount coloured chalk on the rotor tips, and see how they mark a linen sheet.

Grimaldi killed the fuel feed, but the spinning rotor tips slammed into the ground and snapped off at the hubs.

The jet power to be supplied from engines within the helicopter and piped to the rotor tips.

The rotor tips are tapered and swept back.

In both these versions, power was provided by rocket motors on the rotor tips.