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Propeller Design

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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