
Just after Christmas, Sikorsky [LMT] and Boeing [BA] released two photographs of the SB-1 Defiant compound helicopter prototype, which has been completed and rolled out of the West Palm Beach, Fla., hangar where it was built.The aircraft is one of two advanced vertical-lift prototypes participating in the U.S. Army’s Joint Multirole tech demonstration (JMR-TD) Program.Two new photos show the coaxial, rigid-rotor design of the aircraft in detail. It has eight rotor blades, four each on two counter-rotating main rotors. An…