Lift-Propulsion System Weight Variation for Very Heavy Lift Helicopters

摘要

The lift-propulsion system (LPS) weights of single and tandem rotor shaft-driven helicopters and single rotor tip-driven helicopters were estimated using weight trend equations for vehicle gross weights up to 250,00 lb (113,636 kg). The tip-driven helicopter configuration had the lowest LPS weight over the entire gross weight range and the greatest potential for achieving useful loads in excess of 60,000 lb (27,216 kg). Results of the sensitivity analysis indicate that disc loading, number of blades, and solidity of the main rotor are the most significant parameters affecting LPS weight. The application of circulation control rotor technology to very large helicopters with tip-driven rotors can reduce LPS weight by as much as 19 percent. (Author)