Sukhoi PAK FA

[gadeshi]

 

[gadeshi]

ZSh-10 Helmet aramide shell:

All the worlds best ejection seats are capable of up to 790km/h safe ejection, up to 925km/h maximum unsafe (75% injured, 50% dead) and 1100km/h is technical maximum.
Russian ejection seats provide 1400km/h safe ejection, so ZSh-10 doesn't use carbon fiber but uses several kinds of aramide fibers on special polymer matrix to withstand that speeds.

 

[p2prada]

@gadeshi

What do you think is the empty weight of PAKFA? I am speculating it to be around 16 tonnes, possibly 500 Kg less than Su-35BM. At the same time I am expecting a fuel load of 10.5 tonnes on PAKFA vs 11.5 tonnes on Su-35 because of the thinner fuselage, even if the wings are larger.

 

[gadeshi]

Т-50 Analysis (unofficial):

Length: 19.7 м (without pitot tube on the nose)
Wingspan: 13.95 м

Squares and areas:
Side view: 27.81 sq.м
Top view: 115.6 sq.м
Front view: 9.47 sq.м
Total lifting area: 82 sq.м

Airframe total vollume: 62.45 cub.м

MTOW: 33320 кg
NTOW, 50% fuel: 23400 кg
NTOW, 100% fuel: 27280 кg
Empty weight: 15500 кg
Fuel: 8700 кg (100%) / 5000 кg (57%) - uncertain for now, depends on real vollumes which are unknown

Total bays vollume: 8 cub.м
Specific bays vollume: 13 %

Payloads:
Option 1: 4220 кg (8 x AB-500 external + 2 x R-73/74 internal)
Option 2: 2400 кg (2 x RVV-BD 1400 кg + 2 x AKU launchers 200 кg + 2 x RVV-SD 380 кg, 2 AKU launchers 100 кg + 2 x RVV-MD 220 кg) all internal
Option 3: 9020 кg (4 x AB-500 2000 кg + 2 x R-73/74 220 кg internal + 2 x PTB-3000 LR tanks 2800 kg + 8 x AB-500 4000 кg external)

Other options up to 10000 kg

Max speed: 2200 - 2650 км/h
Supercruise: 1850 - 2100 км/h

Hydraulic system pressure: 350 кg/sq.sm (4 gen fighters have 280 kg/sq.cm)

 

[Austin]

Interview with Sergei Bogdan Test Pilot PAK-FA , Su-35 ( use translator )

Летчик Сергей Богдан: боюсь высоты, но надо себя преодолевать | РИА Новости

 

[gadeshi]

It is claimed to be an Article 30 LPC prototype:

 

[SATISH]

@gadeshi

Yes the Item 30 has entered prototype manufacturing phase...but this time we couldnt get much inside info like the 117C...so what is cooking?

 

[TrueSpirit]

Yes, there are at least 4 hardpoints on the wing consoles.
Another 2 are under the intakes.
So, it is rumored that PAK FA can cary up to 10000kg to almost 1000km on Hi-Low-Hi profile when stealth is not required.
Also this speaks about the weapons tests coming soon in Akhtubinsk.

That's some really awesome firepower. Provided the A-A missiles in development for PAK-FA get completed in time, this is going to be the bird that would rule the skies in Asia.

 

[gadeshi]

@gadeshi

Yes the Item 30 has entered prototype manufacturing phase...but this time we couldnt get much inside info like the 117C...so what is cooking?

They cook an engine with specific thrust about 11.5 and 11700 dry / 17500 full thrust with a 6000 - 9000 hours of life
There are rumors about a possibility to reach Bryton cycle absolute maximum for this class of engine - 2300K before HPT and 19800kg of thrust

 

[gadeshi]

 

[p2prada]

@gadeshi

Isn't the fuel capacity too less? The aircraft has a fuel fraction of 0.36 vs 0.42 on Su-35BM. I thought the idea was to go up.

Anyway, the F-135 is already at 2200K before HPT.

 

[gadeshi]

PAK FA analysis has been made by aircraft design pros outside of the project using finite volumes method. So the real data can be different.
Also it is the fact that PAK FA is sugnificantly lighter than any T-10 and has smaller size and volume which can demand less fuel capacity for even greater range.
Don't forget aerodynamics of T-50 which is closely adapted for long supercruise flights...
Anyway, the real data we will see no earlier than through 10-15 years to come

Yes, F-135 has 2200K however it is another class of engines - it is 1.5 times larger and havier than AL-31/117/30 or F-100/110/119 series, so its data can be more or less proportially higher (including 1.5 times greater fuel consumption).

 

[gadeshi]

Spotting in Zhukovskiy (Gordiy airbase) - T-50-3 avionics and weapons testbed (1-st photo) and T-50-1 High AOA testbed:
Note the spin breaking parachute container in the tail boom "sting".

 

[gadeshi]

Spotting in Zhukovskiy (Gordiy airbase) - T-50-1 high AOA testbed (1-st photo) and T-50-3 avionics and weapons testbed:

 

[gadeshi]

Spotting in Zhukovskiy (Gordiy airbase) - T-50-3 avionics and weapons testbed:

 

[p2prada]

Also it is the fact that PAK FA is sugnificantly lighter than any T-10 and has smaller size and volume which can demand less fuel capacity for even greater range.

Couldn't payload be exaggerated vs fuel load? The last I heard payload was supposed to be 7.5-8 tonnes and fuel load was 10+ tonnes.

I don't believe that PAKFA (8.7 tonnes internal, range 3600 Km) can carry lesser fuel compared to the F-22 (12 tonnes with tanks, range 2900 Km) and manage to outrange it while carrying two equally powerful engines, no matter how fuel efficient the PAKFA engines are. Being 3 tonnes lighter, better fuel consumption and higher L ratio won't give PAKFA such a BIG advantage.

Even F-35C (8.9 tonnes fuel, range 2500Km) with lesser power and performance won't match up to PAKFA. Over 1000 Km range advantage with lesser fuel capacity.

Now if we say the T-10 carries 10.5 tonnes of fuel and gives a range of 3000 Km and the T-50 carries 10.5 tonnes of fuel and gives 3600 Km. That's more believable. That's a greater than 20% difference while both T-10 and T-50 are of similar empty weights. T-10's weaker engine is offset by T-50's greater fuel efficiency in this case.

Anyway, the real data we will see no earlier than through 10-15 years to come

I am guessing it will be released in 2020 with the Indian FGFA ready for IOC. Since it is also the export model. So 7-10 years.

 

[gadeshi]

Yes, T-50 can have different (greater) fuel capacity as I've mentioned above.
Those data are not official one. It has been preliminary calculated using finite airframe vollumes method to have some reasonable assumptions while the official data is not available. So, you may be right, but we can learn it 7-10 years later

As for F-22... Guys from TsAGI and SibNIIA figurally say that it is "The triumph of brute force on the aerodynamics". And its engines with low bypass ratio have enormous fuel consumption compared to generic, normal bypass ratio engines, especially in supercruise mode. So, it can cary more fuel to fly less distance...

 

[Austin]

I believe Sergei Bogdan in an interview mentioned that PAK-FA carries more fuel then flanker even though its a smaller aircraft then flanker , the figure I remember discussion on another board was 1 T more internal fuel .

 

[p2prada]

I believe Sergei Bogdan in an interview mentioned that PAK-FA carries more fuel then flanker even though its a smaller aircraft then flanker , the figure I remember discussion on another board was 1 T more internal fuel .

Yeah I remember the same. I tried looking for it through your account, but I gave up. You had posted it here.

He may have been comparing to the Su-35BM too. But carrying even 10 tonnes will give it more fuel than a 2 seat Su-30. Too bad he didn't specify which Flanker.

So that's anywhere between 9.5 tonnes on MKI and 11.5 tonnes on BM. Pretty sure he was talking about a Su-27 or a BM rather than the MKI/Su-30.

 

[Austin]

Right now all data on PAK-FA are of speculative nature and yes what Bogdan said was also relative , I think there will be lots of speculation till Sukhoi releases some official data on it.