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Author Topic: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II  (Read 443210 times)

Offline fightingirish

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Slán,
fightingirish

Slán ist an Irish Gaelic word for Goodbye.  :)

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McDonnell Douglas Model 225 painting by "The Artist" Michael Burke (Tavush) 2018, found at deviantart.com and at Secret Projects Forum » Research Topics » User Artwork » McDonnell Douglas Model 225 Painting

Offline LowObservable

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #16 on: June 28, 2012, 01:21:32 pm »
"And by the way, let's stop painting the Bort number on the tail, or anything else removable."

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #17 on: June 29, 2012, 03:58:35 am »
^or more particularly, transferable  ;)
風 Swift as the wind
林 Quiet as the forest
火 Conquer like the fire
山 Steady as the mountain

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #18 on: July 01, 2012, 03:12:45 am »
via Comet

Static Stress Testing
風 Swift as the wind
林 Quiet as the forest
火 Conquer like the fire
山 Steady as the mountain

Offline Deino

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #19 on: July 31, 2012, 08:59:46 am »
Not sure if already posted but no. 52 has its own tail back again !!! ... together with some calibration markings
http://russianplanes.net/id82183
http://russianplanes.net/id82184
 
 
Deino
« Last Edit: July 31, 2012, 01:35:32 pm by flateric »
He was my North, my South, my East and West,
My working week and my Sunday rest,
My noon, my midnight, my talk, my song;
I thought that love would last forever; I was wrong.
...
For nothing now can ever come to any good.
-------------------------------------------------
W.H.Auden (1945)

Offline flateric

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #20 on: September 10, 2012, 11:39:49 am »
T50-1 back on track (so far taxies). Thanks to Pavel Noddlov
http://russianplanes.net/id85929
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Radical

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #21 on: September 14, 2012, 01:24:14 am »
Well, now that we have lots of high-resolution pictures of the T-50 airframe, what are some educated predictions on its aerodynamic performance? How good is it on the area rule? Assuming that the T-50 has the hypothetical engines that match the F119's performance, how does its aerodynamics compare to the F-22's at various speeds and altitudes? Maybe engineers like Sundog can provide some insight?

Offline sferrin

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #22 on: September 14, 2012, 06:04:56 am »
Assuming that the T-50 has the hypothetical engines that match the F119's performance,

Why would one assume that?
"DARPA Hard"  It ain't what it use to be.

Offline flanker

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #23 on: September 14, 2012, 07:24:42 am »
Assuming that the T-50 has the hypothetical engines that match the F119's performance,

Why would one assume that?

117 don't, but do you have any reason for why Phase II wont?
Push the envelope,watch it bend.

Offline saintkatanalegacy

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #24 on: September 15, 2012, 05:48:23 am »
Well, now that we have lots of high-resolution pictures of the T-50 airframe, what are some educated predictions on its aerodynamic performance? How good is it on the area rule? Assuming that the T-50 has the hypothetical engines that match the F119's performance, how does its aerodynamics compare to the F-22's at various speeds and altitudes? Maybe engineers like Sundog can provide some insight?

By looking at the patent, the front section of the fuselage is trapezoidal as it blends with the body instead of tapering. They paid great attention to area rule by making the transition of cross sections as "smooth" as possible so it won't be draggy. So the result is a flat plane. The downside, however, is that it can be structurally risky at the rear section.

The "competing design team" claimed that it was too flimsy and will break if it went supersonic. Of course, we know that the claim was blown out of proportion.

As for the max speed, they somehow reduced the requirement.
風 Swift as the wind
林 Quiet as the forest
火 Conquer like the fire
山 Steady as the mountain

Offline Avimimus

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #25 on: September 15, 2012, 06:19:57 am »
Assuming that the T-50 has the hypothetical engines that match the F119's performance,

Why would one assume that?

In order to compare the relative aerodynamic efficiency of the designs (eg. at the same thrust - how much drag do they produce)?

The "competing design team" claimed that it was too flimsy and will break if it went supersonic. Of course, we know that the claim was blown out of proportion.

As for the max speed, they somehow reduced the requirement.

I hadn't heard about this claim! Any other additional information? I'm curious about the competing designs...

Such a claim may not be blown out of proportion (just mistranslated). One of the requirements of the PAK-FA was sustained supersonic maneuverability (to aid in kinetically defeating surface to air missiles). So, any structural flaw could lead to fatiguing of the airplane.

The maximum speed requirement was reportedly relaxed in order to meet payload requirements while using existing engines.

Offline flanker

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #26 on: September 15, 2012, 06:55:49 am »
There was a long winded interview with "competitors". Apparently, according to them, PAK FA has huge buffeting problem making it impossible to break sound barrier and travel above 600 km/h (iirc). That turned out to be nice pile of BS, as T-50-1 broke soundbarrier for first time 10'th March 2011.
Push the envelope,watch it bend.

Offline sferrin

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #27 on: September 15, 2012, 08:47:23 am »
There was a long winded interview with "competitors". Apparently, according to them, PAK FA has huge buffeting problem making it impossible to break sound barrier and travel above 600 km/h (iirc). That turned out to be nice pile of BS, as T-50-1 broke soundbarrier for first time 10'th March 2011.

Any pics of competing design(s)?
"DARPA Hard"  It ain't what it use to be.

Offline flanker

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #28 on: September 15, 2012, 01:52:06 pm »
Not til you dont dodge my question.  ;D And after that, no.
Push the envelope,watch it bend.

Radical

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Re: Sukhoi T-50 Su-50 PAK FA - flight testing and development Part II
« Reply #29 on: September 16, 2012, 08:31:03 pm »
Assuming that the T-50 has the hypothetical engines that match the F119's performance,

Why would one assume that?

I'm curious about the aerodynamic performance of the PAK-FA's airframe and shape and how it compares to other aircraft like the F-22. I want to remove other variables such as engine thrust.