Russia’s Su-57 jet has performed 16 test flights with a new engine.
Rostec Aviation Cluster Industrial Director Anatoly Serdyukov told local media:
“Currently, the engineering bench tests of the advanced engine continue and the item is being tested on a flying laboratory. In October, another flight was performed to check the item’s characteristics in various flight modes, specifically, the operation of the vectoring jet nozzle and the oil system at negative overloads. Overall, 16 flights on a flying laboratory were performed,” Serdyukov reported.
Pre-production and initial production batches of the Su-57 will use interim engines, a pair of NPO Saturn izdeliye 117 engines. Closely related to the Saturn 117S engine used by the Su-35S but underpowered for the new aircraft.
Back in December 2017, the second Su-57 prototype, fitted with the Izdeliye 30 engine, first took off from the Gromov Flight Research Institute. The Izdeliye 30 features a new nozzle with serrated flaps compared to conventional ones on the Izdeliye 117 nozzle.
On 8 February 2018, Russian Deputy Minister of Defence Yury Borisov said that the new engine’s performance was “…difficult to judge, because all we have had is this one flight. Everything seems normal, but… many flights are to be performed. As a rule, such trials take 2-3 years”.
As of this month, Rostec has conducted 16 flights of the Izdeliye 30 engine to check its characteristics in various flight modes, specifically, the operation of the vectoring jet nozzle and the oil system at negative overloads