Understanding the Decibel Level of Sukhoi Aircraft at Takeoff
The decibel level of a Sukhoi aircraft at takeoff can vary depending on the specific model. Military jets like the Sukhoi Su-27 or Su-57 produce noise levels around 130 to 140 decibels at takeoff. This level is comparable to the noise produced by other military fighter jets and is significantly higher than commercial aircraft which typically range from 85 to 100 decibels during takeoff. It's important to note that decibel levels can be influenced by various factors including engine type, altitude, and atmospheric conditions.
Comparison with Other Sounds and Aircraft
While 130 to 140 decibels is the standard for military jets, let's put this into perspective. The noise level of a firearm, such as a gunshot, can be around 150 decibels. This doesn't vary much, regardless of caliber, ranging from 155 decibels for small sidearms to 165 decibels for magnum sidearm cartridges and full-power rifle calibers with shortened barrels. Military jet engines also do not vary significantly; the Su-27, MiG-29, Su-25, and Su-24 all produce between 148 and 155 decibels. However, aircraft with turbojet engines, like the MiG-25 and Tu-22, are noticeably louder, as are older aircraft with afterburners.
The Tu-95 is known as the loudest aircraft in the world. The sound is significantly different but not much more intense than high-performance turbojet engines. When it comes to large transport jets, like the Il-76, Il-78, and An-124, they use more economical high-bypass turbofan engines which range from 90 to 100 decibels.
Personal Experience and Observation
As someone with experience working with the F-16 squadron, I can attest to the sheer volume of a Sukhoi during takeoff. The noise level is highly dependent on throttle settings, ambient temperature, and distance from the aircraft. Here are some descriptions based on my observations and personal experience:
At Idle Thrust: Inside a hardened shelter, 120 decibels is uncomfortable. With the jet's intake in front, the noise is very high-pitched, especially on the Viper, and it's painful even with ear protection. This is already at idle thrust, before the actual takeoff.
During Takeoff: On a clear, cold, and still winter day, standing just 10 to 15 meters from the nozzles, the takeoff sound is a physical force. It's at around 190 to 200 decibels, far above any point where hearing should start to degrade. Even with double hearing protection, prolonged exposure can lead to permanent hearing damage or loss.
The threshold for hearing pain is around 140 decibels, and 130 decibels can cause permanent hearing damage or even knock you out, depending on the duration and proximity.
Conclusion and Safety Considerations
The decibel level of Sukhoi aircraft at takeoff is comparable to firearms and other high-decibel military jets. Understanding and adhering to safety protocols, such as wearing appropriate hearing protection, are crucial for anyone working near or observing these aircraft. If you are not properly protected, the sound levels can cause immediate discomfort and potentially permanent hearing damage.