Investigation of Advanced Helicopter Structural Designs. Volume 1. Advanced Structural Component Design Concepts Study

Abstract

Abstract : Design studies have shown that weight and cost of a medium-size utility helicopter can be reduced through application of advanced concepts and materials. A baseline helicopter of conventional design was compared with designs employing advanced concepts and materials for the same gross weight. Results showed that weight empty (less engines, avionics, contingency) was reduced 12%, cost was reduced 3%, and payload was increased 70% (960 to 1634 pounds). By incorporating the advanced concepts and materials into the initial design for the same payload, even greater reductions were found in weight and cost. Gross weight was reduced 14%, weight empty (less engines, avionics, contingency) 21%, and weight empty costs 14%. A risk and feasibility assessment was made for the airframe and landing gear, rotor and control system, and transmission structures. The airframe and landing gear were found to be of medium risk and feasibility. Rotor and control system risk is low, and feasibility is high. The transmission structures have medium risk and high feasibility.