An intensive overview of the analytical theory and procedures used to evaluate performance characteristics of helicopters. Emphasis is placed on subsonic aerodynamics, rotor blade aerodynamics, pitot static system performance, hover performance, vertical climb performance and level flight performance.
Anticipated Student Academic Outcomes
Upon successful completion of this course of instruction, the student will have a basic understanding of performance flight test procedures, techniques, and data analysis. He/she will:
Be familiar with
1. Standard atmosphere and the associated tables.
2. The non-uniform induced velocity theory through the hovering disk.
3. Basic definitions of disk loading, power loading, solidity ratio and figure of merit
1. The fundamentals of dimensional analysis.
2. Subsonic aerodynamics principles.
3. Pitot static principles & PEC requirements.
4. Momentum theory and blade element theory.
5. How to determine engine characteristics.
6. How power required to hover, vertical climb and for level flight is affected by helicopter parameters and atmospheric properties
1. How Coefficient of Power and Coefficient of Thrust are used for determining hover ceiling.
2. How to measure and evaluate pitot static position errors.
3. How to test & evaluate hover performance of rotary wing aircraft.
4. How to assess engine performance.
5. How to measure the weight and center of gravity of an aircraft.
Sequence of Instruction
Performance Testing Overview
Rotor Blade Aerodynamics
Hover Performance Theory and Flight Test Techniques
Vertical Climb Performance Theory and Flight Test Techniques
Level Flight Theory and Flight Test Techniques
Texts and Reference Materials
“Helicopter Performance, Stability and Control,”
R. W. Prouty
NTPS Course Notes
Process of Evaluation