title: How many rotor blades does your helicopter have?
authors.affiliation: Sikorsky Aircraft Corp., Stratford, CT, USA.
authors.forename: Vaughan
authors.initials: V
authors.lastname: Askue
mesh_terms: D017732:Air Ambulances; D004867:Equipment Design; D009622:Noise; D014481:United States; D014732:Vibration