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Model Test Results of the Split-Fan Cross-Ducted Propulsion System Concept for Medium Speed V/STOL Aircraft
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English
Abstract
Propulsion systems for Navy V/STOL aircraft have unique design requirements from which has emerged a diversity of proposed configurations. During recent years the Lockheed-California Company has been involved in design studies of a split-fan, cross-ducted propulsion system concept that meets the V/STOL requirements with conventional turbofan engine configurations. This concept utilizes fixed engines/nacelles with thrust vectoring for lift, and transfer of engine fan air between variable area nacelle nozzles for aircraft control and trim. A simple, lightweight cross-duct coupling between engines also provides engine-out roll trim, and is adaptable to either a twin or four engine configuration.
A joint Lockheed/Navy experimental test program was conducted, utilizing a 0.25 scale propulsion internal flow model, to establish the flow transfer performance and the capability to generate nozzle forces for aircraft thrust, lift, and control. A description of the model, test set-up, and preliminary performance results that demonstrate concept feasibility are presented herein.
Authors
Citation
Beck, W., Carlson, J., and Baas, J., "Model Test Results of the Split-Fan Cross-Ducted Propulsion System Concept for Medium Speed V/STOL Aircraft," SAE Technical Paper 841495, 1984, https://doi.org/10.4271/841495.Also In
References
- Glasgow E.R. Beck W.E. Carlson J.G. “Cross-Ducted Propulsion Systems for Medium-Speed V/STOL Applications” SAE Paper 831493 October 1983