JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisites

Low speed aerodynamics

Course Objectives:

• Understand the elements of helicopter aerodynamics and ground effect machines, their components and methods of control.
• Formulate the mathematical model using simple blade element theory, analyze its figure of merit and evaluate power estimations.
• Evaluate performance and its effect on altitude and understand the preliminary stability aspects of helicopters.
• Apply the aerodynamics, propulsion and control concepts for various VTOL and STOL aircraft and ground effect machines.

Course Outcomes:

• Working principle of helicopter
• Types of helicopter

UNIT - I: ELEMENTS OF HELICOPTER AERODYNAMICS

Configurations based on torque reaction, jet rotors and compound helicopters, methods of control, collective and cyclic pitch changes, lead and lag, flapping hinges.

UNIT - II: IDEAL ROTOR THEORY

Hovering performance, momentum and simple blade element theories, figure of merit, profile and induced power estimation, constant chord and ideal twist rotors.

UNIT - III: POWER ESTIMATES

Induced, profile and parasite power requirements in forward flight. Performance curves with effects of altitude, preliminary ideas on helicopter stability.

UNIT - IV: LIFT, PROPULSION AND CONTROL OF VSTOL AIRCRAFT

Various configurations: propeller, rotor, ducted fan and jet lift, tilt wing and vectored thrust, performance of VTOL and STOL aircraft in hover, transition and forward motion.

UNIT - V: GROUND EFFECT MACHINES

Hover height, lift augmentation and power calculations for plenum chamber and peripheral jet machine, drag of hovercraft on land and water, applications of hovercraft.

TEXT BOOKS:

• 1. Gessow A, and Myers G C, ―Aerodynamics of Helicopterǁ, Macmillan &Co., 1st Edition 1987.
• 2. McCormick B W, ―Aerodynamics of V/STOL Flightǁ, Academic Press, 1st Edition, 1987.

REFERENCE BOOKS:

• 1. Johnson W, ―Helicopter Theoryǁ, Princeton University Press, 1st Edition, 1980.
• 2. McCormick BW, ―Aerodynamics, Aeronautics and Flight Mechanicsǁ John Wiley, 1st Edition, 1995.
• 3. Gupta L, ―Helicopter Engineeringǁ, Himalayan Books, 1st Edition, 1996. R18 B.TECH AERONAUTICAL ENGG. III YEAR