A new photograph of the Russian T-50 has emerged, showing the aircraft in flight testing with the ‘second stage’ engine.
Продолжаются испытания нового двигателя. Т-50 Летающая лаборатория в ЛИИ им. Громова. @UAC_Russia pic.twitter.com/XMa9u1l4xD
— Николай Краснов (@Nasok) May 17, 2018
The new image shows another flight test with what will eventually become the standard engine for the Su-57 fighter jet. The ‘second stage’ engine is still under development and flight testing so far has focused on having the prototype powered by only one of the new engines.