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Sukhoi PAK-FA / FGFA: Updates,News & Discussions

if u watch the pic carefully the plane in pic has cockpit glass as elliptical while T-50's cockpit glass and the area behind the cockpit the triangular

Thats how the twin seat config for T-50 and FGFA will look like.
 
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ADVANTAGES OF T50'S LERX
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PAK FA Features Movable LERX, this would be more like a Stealthy Canard.


LERX are fillets or strakes, typically roughly triangular in shape, running from the leading edge of the wing root to a point near the cockpit along the fuselage. They tend to be fairly small in span, extending out less than a metre.

On a modern fighter aircraft they provide usable airflow over the wing at high angles of attack. In cruising flight the effect of the LERX is minimal. However: when the angle of attack increases, as in a dog fight, the LERX starts to generate a high-speed vortex that remains attached to the top of the wing. Due to the effects described by Bernoulli's principle the wing therefore has a low pressure zone on top, and continues to generate lift past the normal stall point. The F/A-18 Hornet has especially large examples, as does the Sukhoi Su-27. Early prototypes of the Su-27 crashed due to poorly designed LERX, causing it to freeze at angles of attack above 5 degrees. This has since been overcome. In fact, the LERX help to make possible advanced maneuvers such as the Pugachev's Cobra, the Cobra Turn and the Kulbit.

LERX can be seen pitching downward to create more lift
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LERX + 3 AXIS TVC GIVES T50 UNRIVALLED SUPERMANUVERABILITY:enjoy:
 
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PAK FA INLET GEOMETRY
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Air intake ducts are not curved to shield engine compressors as in the Raptor; instead ducts are blocked using composite material. Similarly, the nozzles are blocked to shield turbine blades. The extent of shielding is variable. It is minimized when engine power requirements are high. The blocking concept is illustrated in the video below.
 
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