The T-50 (PAK-FA) Thread

[countto10]

LOL, Why does it get so hot that you need to cool it? And what do you do if you can not cool it enough? I guess i already told you.

Its funny how you try to prove me wrong when cooling is need because it is spinning too fast :)

It gets hot because the intake compression heats up the air dramatically as it slows to subsonic, then further heat is added by the compressor stages, then more heat needs to be added in the combustor to actually add work. That's why the HPT is always the most stressed part and metallurgists and engineers go to great length to produce super-alloys and blades with in-built air-cooling channels that create a protective boundary layer around the HPT blades.

 

The blades are under immense stress from the spinning and the load imparted by the air giving up work to the turbine but ultimately it could handle the job quite easily at 20degC. You are however kind of right in that a larger compressor will cause less heating at high flow rates just as a larger turbo in a car is more efficient at high boost. More complex ramps will also help but the real break-through technology will be pre-cooling.

Edited August 26, 2013 by countto10

[combatace]

There is something more to it when air gets heated. Air gets heated passing through middle stages of compressor and when it comes to the final stages it is very in effective if you compress heated air only to expand it by heating, this is reduction in compression ration. Not the higher turbine speeds you have more the air will get heated reducing compression ration which is undesirable so what engineers do is increase number of stages of compressor but they cant add more as that increases the engine weight reducing thrust to weight ratio.

So engine design is something that is bounded by the available materials. And what was done on MiG-31 engines is they have good number or turbines combines with larger diameter resulting in huge thrust.

[mikoyan]

Im not fighting Im just saying that F-22 and T-50 has same design approach. And that this aircrafts are too small to make speeds of MIG-31 or Blackbird. Smaller wheel spins faster than the big one, as faster it spins as bigger load on construction, I don't need internet to understand that.

 

I don't agree with you that missile will solve all the problems. It seems I was right, because missile don't track as good as they were FC1.

Wasn't the Concorde designed to use small diameter turbojet to reduce drag? Or was it the tu-144? They could have used a turbofan by sacrificing drag efficiency. Let me know if I'm wrong?

[DEChengst]

First footage of T-50 at MAKS 2013:

 

UOnPtDY3cEA

[Weta43]

I wonder what the manouver that's cut away from at 10:56 is - the plane just starts to build up some rotational speed then the shot stops..

( and why the cut away ? was it courtesy - leave the best bits for the show - or was it 'lets not show anything too flash to this show's audience ? ' )

[AlexHunter]

3FeBo3pQMJw

[NRG-Vampire]

3FeBo3pQMJw

 

thanks Alex ^

 

oplaa, oplaa and doing cobra @ 0:30 :thumbup: that was the moment what we missed Weta

Edited August 29, 2013 by NRG-Vampire

[Pilotasso]

Need to get revell PAK-FA Model kit :)

Edited August 29, 2013 by Pilotasso

[NOLA]

Need to get revell PAK-FA Model kit :)

 

It is Zvezda kit reboxed and looks nothing like the real thing imho.

[AlexHunter]

T-50 turn

EUTR_D9BL1s

 

 

1:33 with the words of the chief pilot Sergey Bogdan at the MAKS-2013 show aerobatic capabilities inherent in the T-50, only about 40%, the rest of the stupid crap journalists can not listen :)

qGVzL3VtMiM

Edited August 30, 2013 by AlexHunter

[Pilotasso]

It took much longer than the flanker to make a 360 turn :S

[AlexHunter]

It took much longer than the flanker to make a 360 turn :S

 

taking into account the limitations of the show 5g just 16 seconds for a full turn

[AlexHunter]

Visiting the PAK-FA:

.... http://aviator-ru.livejournal.com/364094.html

Edited August 30, 2013 by AlexHunter

[*Rage*]

Need to get revell PAK-FA Model kit :)

 

Much as I want to love it, its just not as sexy as the flanker.

[AlexHunter]

"Surreptitious advertising" company apple :)

 

....http://fotografersha.livejournal.com/429658.html?nojs=1

 

 

Edited August 31, 2013 by AlexHunter

[countto10]

[Exorcet]

You can see clearly that F-22 just can't reach Mig-31 speed because of engines blades can not spin that fast without self destruct.

 

What Im saying is that maneuverability is a big factor, if you could only rely on missiles, we would have aircrafts that had same design approach as Blackbirds and Mig-31.

 

 

We don't know F-35 top speed nithere, It doesn't make it the fastest aicraft in the world because it can supercruise.

 

Pilotasso you and GG have since FC1 been saying that missiles should be even more effective and hit target even more than they did in FC1. If we are believing that ED are doing something right with the missiles simulation which points to opposite opinion then yours since FC1.

 

And trust me there is a lot you and me don't know about how effective jammers are today. They might blink them, or use macros :)

 

Why is agility on good for dogfighting? The F-22 is agile because it needs to dominate BVR and remain difficult for SAM's to shoot down. Dogfight is probably a [close] second but I doubt it's the main reason.

 

I also very highly doubt that we'll go back to guns fighting. IR stealth is harder to achieve than radar, and IR seekers and missiles keeping getting better. If anything, we'll probably end up with SBVR (semi-beyond visual range) ET's flying everywhere.

 

Also, being small doesn't help with going Mach 3. The D-21 and X-43 aren't exactly huge. High speed comes from high combustion temp and high exhaust gas speed. Small dimater jets are actually preferred when going fast.

Edited September 1, 2013 by Exorcet

[countto10]

[Pilotasso]

would love to have that translated

[Namenlos Ein]

 

 

 

[Cali]

Nice shots there!

[countto10]

Repost.

Edited September 8, 2013 by countto10

[NOLA]

Ahem, it is even posted on this page, by you even. Repost of repost, of repost.

[countto10]

Ah damn it. For some reason the first video had moved past the start screen so it looked different. Crap!

[mikoyan]

Was this one posted yet?

 

 

Play attention to the levcon movement!

 

Here is a pic I saw at the Key publishing aviation forum

 

http://russianplanes.net/id118924

 

amazing!