Author Topic: Sukhoi T-50 Su-50 PAK FA - flight testing and development  (Read 188722 times)

Offline flateric

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #240 on: June 17, 2010, 11:06:42 pm »
(с) RIA Novosti
thanks to Enisey again!


"The first principle of an airplane is that it stay in the air and get where it is going. And the Russians seem to be as good at this as anyone else." John Steinbeck

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #241 on: June 19, 2010, 06:51:12 am »
so it seems like another picture of the inlet was published. now people are arguing (again) that it is unstealthy.

judging by the picture, 15-40% would be visible when directly viewed at the front. reckon it shouldn't be problematic once the "radar masking options" are put into consideration. ;)
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Offline overscan

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #242 on: June 22, 2010, 09:37:51 am »
Some more nice new photos from militaryphotos.net...

Offline flateric

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #243 on: June 22, 2010, 03:05:43 pm »
finally, Sergey Kuznetcov aka Pilot photos from June, 17 show-up
http://pilot.strizhi.info/2010/06/22/8752

note impressive angle of LEX part travel at some agressive maneuvering photos
« Last Edit: June 22, 2010, 03:13:21 pm by flateric »
"The first principle of an airplane is that it stay in the air and get where it is going. And the Russians seem to be as good at this as anyone else." John Steinbeck

Offline Sundog

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #244 on: June 22, 2010, 06:26:47 pm »
You can see they're down at a large angle in the top pic of the right column in the first post above right after take-off. I still stand by my assertion that they're main purpose is for controlling airflow into the inlets at higher alpha's. That's also due to the fact that leading edge devices don't develop that much added lift on their own, though they do decrease energy loss of the airflow over the top. They only add a lot of lift in conjunction with flaps. As such, their greater contribution due to their position and size is going to be in turning the airflow into the inlet at higher alpha's.

Some have said they take place of the "canards" on the Flanker designs, but I don't really buy into that. Partly because I have yet to see any pics where they are deflected up at any large angles and I just don't see them generating those loads, except maybe as "trimmers", in the Newtonian sense, but I can't help thinking flow separation over them at higher speeds would be more hindrance than help since, unlike a canard, they don't have the trailing edge "slot" effect to keep the airflow energized around it; It's the leading edge of a very long low aspect ratio wing center section/fuselage. In fact, I have only seen them slightly up on the ground and in the pattern and once again, I think that is to facilitate the airflow into the inlets.

I have to say, though, I thoroughly enjoyed the video and the pics and was somewhat shocked to see how much of the manuevering envelope they have opened up so rapidly.
« Last Edit: June 22, 2010, 06:33:38 pm by Sundog »

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #245 on: June 23, 2010, 07:08:54 am »
they somehow function as vortex generators though... :D
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Offline donnage99

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #246 on: June 23, 2010, 07:46:54 am »
I have to say, though, I thoroughly enjoyed the video and the pics and was somewhat shocked to see how much of the manuevering envelope they have opened up so rapidly.
Word! I was also shocked to see such rapid expansion of the flight envelop and the flight was a good solid show as well. 

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #247 on: June 23, 2010, 08:32:43 am »
aye, very impressive turning indeed :)
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Offline flateric

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #248 on: June 23, 2010, 09:33:02 am »
judging by the picture, 15-40% would be visible when directly viewed at the front. reckon it shouldn't be problematic once the "radar masking options" are put into consideration. ;)

Once more: in 2009 Sukhoi filed a patent describing various means of reducing jet engine RCS, at the same time it filed a patent for new 'integral airframe airplane', having the same assegnee names under both claims, including Pogosyan and Davidenko
"The first principle of an airplane is that it stay in the air and get where it is going. And the Russians seem to be as good at this as anyone else." John Steinbeck

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #249 on: June 23, 2010, 04:53:59 pm »
^

I thought there was no patent... ???

although I was aware of that "document"(well, title and authors only) mentioned in the other fora which is leads to the "radar masking options" i posted ;)
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Offline Orphic

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #250 on: June 24, 2010, 08:38:06 am »
finally, Sergey Kuznetcov aka Pilot photos from June, 17 show-up
http://pilot.strizhi.info/2010/06/22/8752

note impressive angle of LEX part travel at some agressive maneuvering photos

If you look at the sequence of pics in the link, the tailplane is only used for the initial takeoff rotation....all other pics after that show combinations of intake flap and rudder toe out in all the turning/pitching maneuvers, occasionally you see that coupled with plus incidence of the tailplane (AC travel balancing and higher CL). Makes me think that this show wasn't even a warm up of what the PAK FA is capable of. Will be interesting to see its capabilities develop over time.

Flateric....do you have links to the Patents you mentioned ?
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Offline flateric

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #251 on: June 24, 2010, 09:44:34 am »
just patent claims filed so far, no patents issued yet
moreover, currently I doubt that we will see illustrations for these patents after they will be issued, but who knows...I'll be monitoring this stuff
« Last Edit: June 24, 2010, 09:49:53 am by flateric »
"The first principle of an airplane is that it stay in the air and get where it is going. And the Russians seem to be as good at this as anyone else." John Steinbeck

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #252 on: June 24, 2010, 01:42:36 pm »
whatever it is, it would either be a blocker or ram coating... which reminds me of the clever elastic blocker posted in youtube.

anyway, any confirmation of a 2000TR module count as final?
« Last Edit: June 24, 2010, 01:47:18 pm by saintkatanalegacy »
風 Swift as the wind
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Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #253 on: June 26, 2010, 03:59:00 am »
flateric, was the flat nozzle posted in paralay a preliminary design?
風 Swift as the wind
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Offline haavarla

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development
« Reply #254 on: June 30, 2010, 08:11:31 pm »
Any news about the RuAF G-suit beeing developed?
By the looks of it, it would come in handy in one of these birds..



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