AMITY UNIVERSITY GURGAONAEROSPACE ENGINEERING

April 2015

Aircraft structure -IPresentation on

Propeller : Propulsion device

Submitted to : Submitted by:

Mr. Vishvnath KHUSHIN LAKHARA

Vashisth Batch 2017

Introduction to the Propeller

• Propeller converts rotational power from the engine into thrust.

• The rotating blade of a propeller shares similar characteristics to a wing passing through the air

• A propeller blade generates thrust F through an aerodynamic lift force component, demands an engine torque Q to overcome aerodynamic drag, and will stall if the local resultant angle of attack of the blade exceeds max

• Additional factors: trailing vortex generation, tip losses, compressibility

Propeller basics

• propeller slip is the difference between the theoretical pitch, geometric pitch, and the actual pitch, effective pitch, of the propeller. An efficient propeller is one which has the least amount of slippage and therefore converts more engine horsepower into thrust.

Types of propeller

• Based on

Thrust generation

Construction

Thrust Generation

• Pull type propeller

• Push type propeller

-are so rare.

Pitch of the pro peller

Pitch is the angler between chord and plane of rotation

On construction and operation basis

1. Fixed pitch Propeller

Variable pitch propeller

Constant rpm propeller

Fathering propeller

• Feathering is changing an aircraft or wind turbine propeller blade by angling the blades parallel to airflow.

• Feathering of propeller is utilize to reduce wind milling effect by matching streamline with pitch.

Reverse pitch propeller

• Used in aerodynamic breaking

Shrouded propellers (Screws)

• Marine industry applications

Thank You