Karel Mořický @moricky.com · Nov 14 Acoustic signature reduction was achieved through a variable-speed, five-bladed main rotor with thin blades and low tip speed. The Fantail antitorque system was designed to eliminate the "siren" effect of typical tail fans. (6/17)
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RAH-66 was not exactly invisible to the naked eye, but that doesn’t mean it was not hard to spot. Its compact size, reduced canopy glint, and five-bladed rotor helped lower its visual signature by minimizing "flicker" effects. (7/17)