Russia's Su-57 stealth fighter jet reaches key 5th gen milestone

Rostec has confirmed the Su-57’s first flight with the new Product 177 engine, marking the start of dedicated flight testing by UAC and UEC. The milestone highlights the role of propulsion in meeting fifth-generation benchmarks for range, speed, and persistence. Rostec says the sortie proceeded normally, validating higher thrust, improved efficiency, and longer service life.