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Tupolev Tu-142 —
Tu-95 "Bear" is one of the loudest military aircraft, particulary because the tips of the propeller blades move faster than the speed of sound. On display at the Oleg Antonov State Aviation Museum. Kiev-Ukraine, Aug 2019.
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When a prop or rotor exceeds speed of sound, it induces "rotor tip stall" which reduces the effectiveness of the system. It also produces a 'crack-crack' sound like the snap of a whip. Most engineers are aware of this and typically try to limit the RPM to avoid the effects. Bear has counter-rotating props and I believe that has much more to due with the sound effects.
Hello mentor, Thanks for your comment, I also think the same way about the rear props, they reduced the problem and improved the efficiency.
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