brake that may be used to slow the rotor after landing, or to secure the blades while parked. A parked gyro- plane should never be left with unsecured blades, because even a slight change in wind could cause the blades to turn or flap. inability to use differential braking, which increases the radius of turns. The rotor blades demand special consideration during ground handling, as turning rotor blades can be a haz- ard to those nearby. Many gyroplanes have a rotor 18-5