AeroII 32 PropellerTheory

Slide1: 

Aero II Lecture 32 Propellers J. E. Brandenburg EAS 3101 Spring 2007

Agenda: 

Stall Speed Propeller theory Propeller designs Agenda

Stall Speed: 

Stall Speed

Stall Speed: 

Stall Speed

Stall Speed: 

Stall Speed

Propellers: 

Propellers Cessna Skyhawk-a highly optimized low speed aircraft

Propeller sections: 

Propeller sections

Propeller Theory: 

Propeller Theory

Slide9: 

Propeller at takeoff (two extremes) Lift Reaction force Propeller hub Propeller tip

Slide10: 

Propeller Theory

Propeller Theory: 

Propeller Theory

Propeller Theory: 

Propeller Theory

Propeller Theory: 

Propeller Theory

Propeller Theory: 

Propeller Theory

Propeller Theory: 

Propeller Theory  1’ 2’

Fixed Pitch Propeller: 

Fixed Pitch Propeller

Adjustable Pitch Propeller: 

Adjustable Pitch Propeller

Propeller Development: 

Propeller Development Wright brothers developed first successful propellers-fixed pitch Two-pitch propellers were introduced to give good low speed and high speed operation Fully variable pitch was introduced to allow full control of pitch Constant Speed propellers are automatically adjusted continuously to keep engine at optimum RPMs

Slide19: 

Propeller Choices

Propeller Evolution With Increasing Engine Power: 

Propeller Evolution With Increasing Engine Power Early War Spitfire-1938 Mid War Spitfire-1943

Propeller: 

Propeller Late War -1944-Buzz Bomb Chaser

Russian Bear Bomber: 

Russian Bear Bomber Contra-rotating propellers on Turboprop engines

Russian Bear Bomber: 

Russian Bear Bomber

C-130 Hercules: 

C-130 Hercules

C-130 Hercules: 

C-130 Hercules