Martian2
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Wrong...Diverterless Supersonic Inlet (DSI) has nothing to do with RCS reduction. Do not mistake the 'diverter' word to mean for impinging radar signals. It is meant for boundary air upon a surface.
Aviation Week says that you are the one that is wrong.
J-20's Stealth Signature Poses Interesting Unknowns
"The diverterless supersonic inlet avoids a signature problem caused by a conventional boundary layer diverter plate – the F-22 has a conventional inlet, which is likely to require extensive radar absorbent material (RAM) treatment."
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As I understand it, if a supersonic-capable aircraft lacks DSI then it needs "heavy mechanical systems" to control airflow into the air inlet. The "heavy mechanical systems" and "many moving parts" require heavy RAM coating to minimize their radar reflection.
http://en.wikipedia.org/wiki/User:Sniperz11/Diverterless_Supersonic_Inlet
"The DSI bump functions as a compression surface and creates a pressure distribution that prevents the majority of the boundary layer air from entering the inlet at speeds up to Mach 2. In essence, the DSI does away with complex and heavy mechanical systems.
The DSI concept was introduced into the JAST/JSF program as a trade study item in mid-1994. It was compared with a traditional "caret" style inlet. The trade studies involved additional CFD, testing, and weight and cost analyses. The new inlet earned its way into the JSF design after proving to be thirty percent lighter and showing lower production and maintenance costs over traditional inlets while still meeting all performance requirements.
Diverterless Inlet The F-35's diverterless inlet lightens the overall weight of the aircraft. Traditional aircraft inlets were comprised of many moving parts and are much heavier than newer diverterless inlets. The diverterless inlet also eliminates all moving parts.[2]"
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