Rotor System: Composite Dual-Speed Rotors With Ice Protection
The Sikorsky S-76D’s main rotor has a wider chord and incorporates swept tips allowing the blades to generate more lift without an increase in power. The four-blade main rotor can operate in high- and low-speed modes for improved takeoff, hover and cruise performance and reduced noise. The system automatically switches from high to low speed and vice versa based on a set of predetermined airspeed and altitude criteria. The technology helps the S-76D fly up to 450 nautical miles on a single fill-up.
The S-76D also incorporates a “quietzone” main transmission; quiet tail rotor (QTR) technology with four enhanced flaw-tolerant, flexbeam composite rotor blades; and main and tail rotor ice protection system (RIPS), offered as an option for flight into forecast icing conditions. The RIPS system is a scaled down version of the icing protection system on the S-92 featuring heating mats embedded within the rotor blades.