neurotech wrote:haavarla wrote:neurotech wrote:Yeah, I remember the Flanker surviving a bird strike and keep running with its KD-36DM engine management system

91-4008 Took-off from Dobbins AFB, Georgia on a planned cross country ferry flight to Edwards AFB, California. Shortly after take-off and during rendezvous with two chase F-15s at 1335 hours the F-22 ingested a 8.5 pound Loon in its right engine. Surprisingly even though a lot of damage to the engine, the engine continued to operate normally.
Damage to the aircraft was to the intake and the engine itself. The engine could not be repaired.
Note: For those who don't get the joke. The KD-36DM is the ejection seat. The engines are AL-31s which
seem to have a service life of ~600 Hours.
Why post stuff that "seems"..
When you can post stuff that "IS".
AL-31FM1 has service life of 2000 hour.
AL-31FM2 has service life of 3000 hour.
http://www.salut.ru/ViewTopic.php?Id=1615And the Flanker does not have F119 engines equivelent.
Its two totaly different engines.
It has this instead:
117S has service life of 4000 hour.
http://npo-saturn.ru/?sat=64
So 600 hours was a little low for total service life.. my bad..I still would be surprised if an AL-31 or AL-41(117S) can go more than 600 hours without an overhaul. Perhaps That_Engine_Guy will make an appearance, and confirm. I personally doubt the engine could get to 4000 hours without MAJOR rebuild during overhaul. Maybe they and make a Blisk fan/compressor stage like the F119, but until that is in FULL production and in service powering a jet fighter, its speculation as to reliability. Pratt & Whitney F119 engines have been in service for over 10 years. GE F414 engines, have been in service over 10 years as well.
The F119 is probably the most reliable engine ever flown in a jet fighter, and the F135 would be close, but hasn't really passed "oh s**t" test of a real in-flight emergency after a FOD incident.
How many Sukhoi pilots have ejected/crashed from a FOD/Bird Strike incident? More than the zero F-22 pilots?
Edit: Wikipedia page states a Saturn 117S engine has a TBO of 1000 hours. We shall see.
All good.
As long as the engine operate in all parameters between each TBO.
All jet engines has a given TBO, so its a moot point.
I'll post this vid for info about how far NPO Saturn whom developed the 117S jet engine. Russia has an exellent take on special alloys that require heat resistance requirement. Like these fan blade shown in this vid.
They are made of ceramic matrices alloy. Briliant stuff, makes it withstand very high temp.
It possess the injection RTM composite fabrication technology used in Snecma's Leap 1B composite fan.
Whatch from 05:00 min
http://www.vesti.ru/only_video.html?vid=370942
Anyway, my point is, Russian jet engine are designed in a different mindset from western jet Engines.
Russian Engines are more T/W focused. Due to their light weight, and high Thrust output(high temp), it quite logical that they have shorter life service.
In short, Russian Engines are more maxed out.
There is no equall to the 117 engines that are used on Pak-Fa when it come the T/W ratio.
The 117 engine has 15.000kgf of thrust, and is 150 kilo lighter if we compair it with the AL-31FM1 engines, which dry weight is 1,570 kilograms.
A T/W ratio at 10,56:1 Not bad at all.