Has any RCS reduction method ever been implement on production Su-35?

flanker

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Supposedly RAM on the inside of the intakes and IGV's. Not sure about canopy, but i think coating on that too.
 

Ronny

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Supposedly RAM on the inside of the intakes and IGV's. Not sure about canopy, but i think coating on that too.
What is IGV?
Inlet Guide Vanes on the engine.
These black things right?. Come to think of it, has there ever been any program to paint the IGV of F-110 or F-100 engine with RAM?. Did have glass I, Have glass II and Have glass V include any RAM on engine IGV or only the inlet duct?
B32D3EB8-787D-4711-841D-F8BAF92D1363.jpeg
 

F119Doctor

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Supposedly RAM on the inside of the intakes and IGV's. Not sure about canopy, but i think coating on that too.
What is IGV?
Inlet Guide Vanes on the engine.
These black things right?. Come to think of it, has there ever been any program to paint the IGV of F-110 or F-100 engine with RAM?. Did have glass I, Have glass II and Have glass V include any RAM on engine IGV or only the inlet duct?
View attachment 678005
Yes, the black struts at the front of the engine fan.

I am unaware of any RAM coating on the IGV on the F100 or F110 engines for the F-15 or F-16. But, it has been a few years and I am not a F110 expert

It is possible to have RAM coatings on the fixed IGV and variable angle trailing edge flaps, but it has to be designed for the coating right from the beginning to effectively reduce RCS and to keep the coatings intact. Remember that if these coatings are liberated at these location, it is immediately ingested into the engine, likely causing significant damage to the rapidly spinning airfoils of the fan and compressor.
 

Ronny

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Yes, the black struts at the front of the engine fan.

I am unaware of any RAM coating on the IGV on the F100 or F110 engines for the F-15 or F-16. But, it has been a few years and I am not a F110 expert

It is possible to have RAM coatings on the fixed IGV and variable angle trailing edge flaps, but it has to be designed for the coating right from the beginning to effectively reduce RCS and to keep the coatings intact. Remember that if these coatings are liberated at these location, it is immediately ingested into the engine, likely causing significant damage to the rapidly spinning airfoils of the fan and compressor.
Why can't they just use the same type of RAM that they would put on the inlet duct? Both the IGV and inlet duct are stationary right?. Come to think of it, does Have glass actually include any RAM in the inlet duct?
 

F119Doctor

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Yes, the black struts at the front of the engine fan.

I am unaware of any RAM coating on the IGV on the F100 or F110 engines for the F-15 or F-16. But, it has been a few years and I am not a F110 expert

It is possible to have RAM coatings on the fixed IGV and variable angle trailing edge flaps, but it has to be designed for the coating right from the beginning to effectively reduce RCS and to keep the coatings intact. Remember that if these coatings are liberated at these location, it is immediately ingested into the engine, likely causing significant damage to the rapidly spinning airfoils of the fan and compressor.
Why can't they just use the same type of RAM that they would put on the inlet duct? Both the IGV and inlet duct are stationary right?. Come to think of it, does Have glass actually include any RAM in the inlet duct?
Remember that RAM is not just paint, it has a non-trivial thickness. If you were to add it to the duct, it would have little aero effect. But the IGV are airfoils used for specific aero purposes and adding that thickness could easily reduce the performance and / or operability of the engine if it isn’t part of the original design. Signature reduction of the propulsion system is a multi-discipline integration of aero, shaping, and coating design.
 

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