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Prop Job: The Efficiency of a Propeller

CSEF · 2008 Aerodynamics/ Hydrodynamics (Junior Division Only)

Loren J. Newton · Villegas (Ysmael) Middle School, Riverside, Riverside County

Overview

Objectives/Goals To determine the optimal combination of blades' design factors to achieve the maximum propeller efficiency at a given engine power level. Methods/Materials Based on the theory of propeller design, I applied algebra to adapt proven laws of physics and derive a formula with factors I could work with. I then designed and assembled a test platform. I also derived various propeller configurations, with different length, width, and number of blades. I then crafted the blades from balsa wood. After mounting each propeller configuration on the platform, I measured and recorded the distance traveled during a 20 second period. Results Long and wide blades had the best results overall. Four blade propellers worked best with short blades, while 2 blade propellers worked best with long blades. The best performing combination was the long and wide 2 blade propeller, and the worst performer was the short and narrow 6 blade propeller. Conclusions/Discussion The thrust power produced by the propeller is shown by overcoming the propeller weight (P*L*W*#)and produce a distance traveled. Propeller design is deriving an optimal combination of blade design factors to match its functional purpose.

Summary statement

To determine the optimal combination of length, width, and number of blades in a propeller combination that would generate the highest efficiency measured by distance traveled ; % = (P * L * W * # * D) / (E * T).

Help received

My dad bought the material and helped build the test fixture. My mom helped me with the presentation board.

Competition history

  • CSEF 2008 Aerodynamics/ Hydrodynamics (Junior Division Only) · Entry J0121

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