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originally posted by: anzha
a reply to: zukli
More than one source says the F-22 has it. It might just be the Su-57 that does not.
originally posted by: RadioRobert
a reply to: zukli
Because it's difficult to get correct geometry. Inlet design is already a bit of witchcraft. Ramps, cones, doors already have generations of experience behind them. DSI inlets require new math. And what works for one engine may need a completely different configuration for another engine. If they are looking to the next engine, for example, there's no reason to produce a taliored example for the current development models. And the improvement over traditional ramps is somewhat minimal and focused on a specific range of airflow velocity whereas ramps and shock cones can be optimal across the envelope.
Sort of like choosing between a swing-wing or fixed -wing solution. Is good enough, good enough or do you need a tailorable configuration?
Having said that, you get a lighter, less complex solution, which may even out perform the ramps or cones across key areas. So properly designed DSI is likely to continue to be seen on supersonic aircraft, regardless of signature benefits.
originally posted by: Barnalby
a reply to: drwire
All that high-alpha maneuverability probably comes at a bit of a cost in terms of intake complexity, especially given what I assume are the relatively limited resources at Sukhoi. You have to remember that they're trying to design a 5th generation air superiority fighter on the kind of budget normally seen at Cessna or Gulfstream.