Make a Manilla Folder Propeller for Physics Project

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A physics project involves creating a car using materials like index cards and manila folders, with a propeller attached for movement. The user seeks dimensions for a propeller that can be made from a manila folder, ideally no larger than three inches across. Concerns are raised about the efficiency of using a propeller for propulsion, suggesting that a simple design with flat-angled blades may suffice. The discussion emphasizes practicality over complex airfoil designs, especially if the propeller won't be spun at high speeds. A straightforward approach to the propeller's design is recommended for optimal performance.
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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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Why do you want to use a propeller to move a car? Seems pretty inefficient to me. And unless you are going to spin that propeller extremely fast, you don't need an airfoil design for it. Just bend the blades at a flat angle.
 

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