Timer model of helicopter class F4F
grabcad
3D printing allows creation of large bladed propellers with three hollow segments and drainage for easy draining. Smaller propellers have two blades on their hubs, while larger ones can have 2-4 blades; static balancing is essential. Hub attachment to gearbox output shafts is customizable, as are blade pitch positions (3-4). Model helicopter F4F follows an obsolete classification. Alternative animal options exist, powered by electric motors with 15 seconds run time, relying on battery life in the shaft pipe. Water for fish propellers is essential.
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