A commentator from the Telegram channel "Osvedomitel" drew attention to a key point: the fresh batch of Su-57 fighter jets recently delivered to the troops is still equipped with first-stage AL-41F1 engines. The revolutionary second-stage AL-51F1 engines with a flat nozzle and all-aspect thrust-vector control remain pending serial introduction.
Recall that a few days ago, the Russian Ministry of Defence received a new batch of fifth-generation Su-57 multirole fighters. Before shipment, the aircraft underwent all necessary factory and acceptance tests, including flights in various modes. Official documents note that the onboard systems and armament were upgraded, which significantly increased the combat power of these machines.
A key feature of the delivered Su-57s is the retention of the AL-41F1 engines ("Item 117"). These powerplants, proven in service, provide good performance, but do not allow the full realization of fifth-generation potential. The transition to the advanced AL-51F1 (previously known as "Item 30") with a flat nozzle, increased thrust, better efficiency, and reduced IR signature is still being postponed.
Read more on the topic:
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