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Amazon.com: RC Plane Folding Propeller 6" 7" 8" 9" 10" 11" 12" 13.5" 14" 15.5" 16.5" w/Different Spinner Size and Motor Shaft Diameter φ3.0 φ3.17 φ4.0 φ5.0 with CNC Aluminum Alloy Spinner (
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aircraft design - What are the advantages/disadvantages of a forward-folding propeller? - Aviation Stack Exchange
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