Russian Su57 crashes.

Profile picture for user PanzerJohn

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https://www.dailymail.co.uk/news/article-7824243/Russias-secret-120m-Su…

I have one question, how can it be stealthy with those exposed engines, the heat signature must be enormous.

Original post

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9 months 3 weeks

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Seems like the first serial production Su-57..possibly FCS related issue as per some sources.

First crash of Su-57 to delay service entry

The unnamed pilot ejected safely and was picked up by a Mi-8 search-and-rescue helicopter. “The pilot managed to escape the crippled machine,” the statement said. It added that the accident happened during an engine check. The aircraft disintegrated completely in an explosion, but since it was flying over an unpopulated territory, there were no casualties or material damage on the ground. The cause for the crash is yet to be determined.

This is the first crash for the Su-57—also known under the manufacturer’s internal designation T-50 and NATO reporting codename “Felon”—since the type’s first flight in January 2010. Ten prototypes were assembled and flown through 2017, in addition to three airframes for ground testing. The airplane that crashed is believed to be the 11th flying aircraft and the first production example to be assembled for subsequent delivery to the VKS.

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Profile picture for user haavarla

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So glad the Pilot made it! 

A setback yes. But so was the prototype "904" Su-35 that crashed early on its development. 

In the end it did not change anything, the Su-35S are very much in active service, and so it will be with Su-57S.

Profile picture for user Dr.Snufflebug

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The article is using photos of the earlier prototypes, hence "exposed engines" and what not. They actually started covering the nacelles long ago, in the latest 4-5 prototypes they built. 

The plane that crashed (supposedly due to some freak control issue, as it entered a flatspin and for Sukhoi jets with TVC, even the craziest post-stall situations and flatspins are complete childs play, super easy to get out of, barely an inconvenience) was the very first actual serial aircraft, so if it had any similarities to the prototype series it would naturally be the latest ones, and thus wouldn't have any exposed metal surfaces in the rear. I mean, naturally.

 

What happened to the dedicated T-50/PAK-FA/Su-57 thread? This forum is unrecognizable, and seems rather dead now after the crazy re-design. 

 

 

 

 

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Future Of Su-57 Next-Generation Engine Uncertain
Piotr Butowski January 06, 2020

GDANSK, Poland—As new details about a next-generation engine for Russia’s premier Su-57 fighter emerge, new concerns are apparent as well.

On Dec. 6, the head of Rostec Corp.’s aviation cluster, Anatoly Serdyukov, provided an update on the state of work on the new-generation Lyulka “izdeliye 30” (product 30) turbofan engine intended for the final modification of the Su-57 fighter, the so-called “second-stage” aircraft. Su-57 fighters currently fly with Lyulka AL-41F-1 (izdeliye 117) engines.

Izdeliye 30 is the first all-new engine for tactical combat aircraft developed in Russia for several decades. The previous Lyulka AL-31F engine entered production together with the Su-27 Flanker fighter in 1981. All subsequent engines, including the AL-41F-1 for the first Su-57s, are upgrades of the base AL-31F.

The clean-sheet design offers a thrust increase, lighter weight, a smaller number of elements and lower operating costs. In December 2014, Russia’s United Engine Corp. CEO Vladislav Masalov said the new engine will be “17-18% more effective” than the current one. If this refers to full thrust, the new izdeliye 30 should provide 17 tons compared to 14.5 tons for AL-41F-1. The engine’s thrust-to-weight ratio is to be more than 10:1. Thanks to glass-fiber plastic inlet guide vanes, the new engine fan would reduce the radar cross section in a front view.

“Bench tests of the future engine are being continued. The engine optimization on a flying testbed is being conducted,” Serdyukov said. “In October, another flight was executed aimed at checking the engine characteristics at various flight modes. Operation of the thrust-vectoring nozzle was checked, as well as operation of the oil system at negative G loads. In total, the flying testbed executed 16 flights.”

The flying engine testbed, the Su-57’s second prototype T-50-2LL, replaced the port engine with a prototype of the izdeliye 30. It performed the first flight on Dec. 5, 2017.

But 16 test flights in two years is not an impressive test pace, especially considering how important this engine is for the Russians.

Serdyukov concluded his remarks with the following: “The issue of the use of this engine on airplanes is currently under consideration.” This statement suggests that it is not yet assured that the Su-57 will receive the new engines in the foreseeable future.

Though there is no official information on the topic, the next-generation engine program faces serious obstacles. The main one is the lack of modern materials that would enable the planned engine characteristics. Replacing planned materials with those that are available is likely to adversely affect the engine’s weight and performance.

The first series-production Su-57 fighter was to be handed over to the Russian Defense Ministry in December 2019, but it crashed Dec. 24 during a handover flight in Komsomolsk-on-Amur. In total, the ministry ordered 74 Su-57s—the first two aircraft for testing and then six operational squadrons of 12 fighters each—with delivery by the end of 2027.

During the Army 2018 exhibition, Deputy Defense Minister Alexey Krivoruchko claimed that from 2023 the Su-57s will be delivered in a “second-stage” configuration, with the new engines. But in a statement to the Russian Defense Ministry newspaper Krasnaya Zvezda in December 2019, Krivoruchko corrected this deadline: Deliveries of the first-stage aircraft will last until the “mid-2020s.”

https://aviationweek.com/defense-space/future-su-57-next-generation-engine-uncertain

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Dr.Snufflebug...yes you cannot even reply.