Design a Propeller for Physics Project

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For a physics project involving a car made from everyday materials, a propeller design is needed that can be created from a manila folder, with a maximum diameter of 3 inches. The design should focus on effective aerodynamics and ease of construction using simple cutting and bending techniques. Participants in the discussion are encouraged to provide specific dimensions and design ideas that optimize performance. The goal is to create a functional propeller that enhances the car's movement. Clear and practical suggestions will aid in successfully completing the project.
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I have a physics project where I am supposed to make a car from index cards, manilla folders, paper clips, drinking straws, glue, tape, rubber bands, etc. I am attaching a propeller to the back, but I need a decent design i can make by cutting and bending a manilla folder. It should not be more than 3 inches across. Pretty, much, i need someone to give me dimensions for a workable propeller.
 
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