"Aerodynamic stability." . . "Fluid Mechanics." . . "Helicopters." . . "Flight control systems." . . . "Predesign of the Second Generation Comprehensive Helicopter Analysis System"@en . . . . . . . . . . . . . "Predesign of the second generation comprehensive helicopter analysis system"@en . . . . . . . "Predesign of the second generation comprehensive helicopter analysis system" . . . . . . . . . . . . . . . "A predesign study was conducted for a proposed Second Generation Comprehensive Helicopter Analysis System (CHAS). A draft Type A system specification was reviewed to determine its validity for a system to analyze helicopter performance, stability and control, loads, aeroelastic stability, and acoustics using consistent technology with a capability for several levels of complexity."@en . . "Flight simulation." . . "Mathematical models." . . "Computer programs." . . "Configuration management." . . "Computer Programming and Software." . . "Systems analysis." . . "Digital simulation." . . . . "Aerodynamic noise." . . "Aeroelasticity." . . "Acoustics." . . "Aerodynamic loading." . .