4 blade propeller
thingiverse
A 4-bladed Propeller Mk2 Design All Mk2 Propellers (https://www.thingiverse.com/thing:2833639) are Compatible with My Hovercraft (https://www.thingiverse.com/thing:2794931) Featuring a 5mm Shaft, This Propeller is Just One of Many Designs I Have Created for Various Applications
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