What kind of helicopter needs a tail rotor?

Question

Question PPL(H) - Private Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

Single-rotor helicopter with shaft drive

QuizVDS · Answer

Twin-rotor helicopter with counter-rotating main rotors

QuizVDS · Answer

Single-rotor helicopter with blade drive

QuizVDS · Answer

Twin-rotor autogyro with counter-rotating main rotors

Id 155 - PPL(H) EN - What kind of helicopter needs a tail rotor?