AE3008 Helicopter Theory Syllabus:
AE3008 Helicopter Theory Syllabus – Anna University Regulation 2021
COURSE OBJECTIVE:
To make the student familiarize with
• the principals involved in helicopters
• The performance and stability aspects of Helicopter under different operating conditions.
• Understand aerodynamics of rotor blades
• Dynamic stability of helicopters
• Considerations of helicopter design
UNIT I INTRODUCTION
Helicopter as an aircraft, Basic features, Layout, Generation of lift, Main rotor, Gearbox, tail rotor, power plant, considerations on blade, flapping and feathering, Rotor controls and various types of rotor, Blade loading, Effect of solidity, profile drag, compressibility etc., Blade area required, number of Blades, Blade form, Power losses, Rotor efficiency.
UNIT II AERODYNAMICS OF ROTOR BLADE
Aerofoil characteristics in forward flight, Hovering and Vortex ring state, Blade stall, maximum lift of the helicopter calculation of Induced Power, High speed limitations; parasite drag, power loading, ground effect.
UNIT III POWER PLANTS AND FLIGHT PERFORMANCE
Piston engines, Gas turbines, Ramjet principle, Comparative performance, Horsepower required, Range and Endurance, Rate of Climb, Best Climbing speed, Ceiling in vertical climb, Autorotation.
UNIT IV STABILITY AND CONTROL
Physical description of effects of disturbances, Stick fixed Longitudinal and lateral dynamic stability, lateral stability characteristics, control response. Differences between stability and control of airplane and helicopter.
UNIT V ROTOR VIBRATIONS
Dynamic model of the rotor, Motion of the rigid blades, flapping motion, lagging motion, feathering motion, Properties of vibrating system, phenomenon of vibration, fuselage response, vibration absorbers, Measurement of vibration in flight. Rotor Blade Design: General considerations, Airfoil selection, Blade construction, Materials, Factors affecting weight and cost, Design conditions, Stress analysis.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
At the end of the course, Students will be able to
CO1: Make use of Aerodynamics calculation of Rotor blade
CO2: Apply stability and control characteristics of Helicopter
CO3: Experiment with control Rotor vibration
CO4: Apply Momentum and simple blade element theories to helicopter’s rotor blades.
CO5: Analyse the power requirements in forward flight and associated stability problems of helicopter.
TEXT BOOKS:
1. John Fay, “The Helicopter and How It Flies”, Himalayan Books 1995
2. Lalit Gupta, “Helicopter Engineering”, Himalayan Books New Delhi 1996
REFERENCES:
1. Joseph Schafer, “Basic Helicopter Maintenance”, Jeppesen 1980
2. R W Prouty, Helicopter Aerodynamics, Phillips Pub Co, 1993.