Thursday, September 28, 2023

Russian Su-57 fighters cause mysterious sound that frightened Moscow residents

Numerous people reported hearing the strange high-pitched ringing sound during a rehearsal of the Victory Day Parade in Moscow, while the four newest Russian Su-57 Felon fighter jets appeared in the sky.

A Moscow resident has described hearing a mysterious ‘scary’ noise in the skies above the city as ‘like something a real howl’.

The Frelon reportedly continues to suffer from developmental issues, including the production of the new turbofan engines. The initial serial production versions lack the promised new-generation engines.


Aviation experts have stressed that Su-57 Frelon is equipped with two advanced versions of an NPO Saturn AL-41F-1 interim variable-bypass ratio turbofan engine. This is a temporary measure until the Russian aviation industry is able to develop a new engine that will meet all the standards of a fifth-generation fighter.

According to the TASS, the fifth-generation Sukhoi Su-57 fighter jet is designed for destroying any type of air and surface targets. It has a supersonic cruising speed, intra-fuselage weapons, radar absorbing coating (stealth technology) and the newest set of onboard equipment.

Earlier in December 2020, Russian Defense Minister Sergei Shoigu told the Defense Ministry’s board meeting that a total of 22 Sukhoi-57 planes would be provided by the end of 2024. Under a contract concluded in 2019 a total of 76 Sukhoi-57s are to be delivered by the end of 2028.

If you would like to show your support for what we are doing, here's where to do it.

If you wish to report grammatical or factual errors within our news articles, you can let us know by using the online feedback form.

Executive Editor


Dylan Malyasov
Dylan Malyasov
Dylan Malyasov is the editor-in-chief of Defence Blog. He is a journalist, an accredited defense adviser and a consultant. He graduated in business management and worked at leading European defense companies before becoming a military journalist. read more



Russia receives additional Su-57, Su-35 fighter jets

United Aircraft Corporation, a subsidiary of the state corporation Rostec, announced on Thursday that it has delivered the Su-57 and Su-35S fighter jets to...