This is an APC 4.1 x 4.1E Composite Speed 400 Electric Propeller. APC propellers are CAD-designed and manufactured to be lighter, stronger and produce less noise and more power than typical propellers.
This is an APC 6 x 4E Thin Electric Propeller. APC propellers offer high performance and low noise advantages over other brands of propellers. 'E' style propellers are specifically designed for use with electric motors.
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