Main Rotor Disk Vortex Interference can cause what effect on the tail rotor?

Main Rotor Disk Vortex Interference can cause what effect on the tail rotor?

• A. Directed onto the tail rotor
• B. Increases tail rotor lift
• C. Reduces tail rotor drag
• D. Causes tail rotor failure

Answer: (A)

Main Rotor Disk Vortex Interference describes how the wakes and vortices shed by the main rotor interact with the tail rotor. The swirling air left by the rotating blades and the rotor’s downwash can be carried into the tail-rotor region, so part of the main-rotor disk’s wake is directed onto the tail rotor. When the tail rotor blades encounter this swirling, nonuniform inflow, their angle of attack and loading can become erratic, reducing efficiency and causing potential buffeting or yaw instability. This direct impingement of the main-rotor wake onto the tail rotor is the key effect described.

Main Rotor Disk Vortex Interference describes how the wakes and vortices shed by the main rotor interact with the tail rotor. The swirling air left by the rotating blades and the rotor’s downwash can be carried into the tail-rotor region, so part of the main-rotor disk’s wake is directed onto the tail rotor. When the tail rotor blades encounter this swirling, nonuniform inflow, their angle of attack and loading can become erratic, reducing efficiency and causing potential buffeting or yaw instability. This direct impingement of the main-rotor wake onto the tail rotor is the key effect described.