Detalles.-

Divertless Supersonic Intakes (DSI) is an air intake that was designed for supersonic flight regime, so the plane doesn´t need to have any variable-geometry air intake. In supersonic flight regime, it is hard for an airplane to turn, especially kulbit´s aerial maneouver type. In order to gain airflow to the engine, most fighters uses variable-geometry air intakes or moving air intakes that we could found in F-22, Su-27, MiG-29, or any other fighters. Fighters such like F-35 doesn´t need any moving parts because it uses DSI. DSI automatically gain airflow to the engine in supersonic flight regime.

A Diverterless Supersonic Inlet (DSI) consists of a "bump" and a forward-swept inlet cowl, which work together to divert boundary layer airflow away from the aircraft's engine while compressing the air to slow it down from supersonic speed.

The small "bumps" just forward of the engine air intakes form part of the diverterless supersonic inlet (DSI) . These inlets also crucially improve the aircraft's low-observable characteristics. The inlet itself has no boundary layer diverter channel, the space between the duct and the fuselage, to reflect radar energy.

 The DSI can be used to replace conventional methods of controlling supersonic and boundary layer airflow for speeds of up to Mach 2, such as the intake ramp and inlet cone, which are more complex, heavy and expensive.

Research into the DSI was done by Lockheed Martin in the early 1990s. The first DSI was flown on 11 December 1996, installed on a F-16 Block 30 fighter and replacing aircraft's original intake diverter. The modified F-16 demonstrated a maximum speed of Mach 2.0 and handling characteristics similar to a normal F-16. It was also shown that subsonic specific excess power was slightly improved. A DSI was later incorporated into the design of the Lockheed Martin F-35 Lightning II.

The JF-17 Thunder, developed by the Chengdu Aircraft Industry Corporation (CAC) as a joint-venture between China and Pakistan, was the world's first fighter in service to employ DSI technology.  The Shenyang J-31, the Chengdu J-10B, the Chengdu J-20 and the Guizhou JL-9 also incorporate DSI.

*Note.-

The "Kulbit" (also known as "Frolov chakra", named after Evgeny Frolov, Russian test pilot) is an aerial maneuver developed by Russian pilots, in which the aircraft performs an extremely tight loop, often not much wider than the length of the aircraft itself. It is an example of post-stall maneuvering, a type of supermaneuverability. Like most post-stall maneuvers, it demonstrates pitch control outside of the normal flight envelope wherein pitch control is made possible by having aerodynamic flow over the aircraft's elevators or stabilators. The Kulbit drastically decreases the aircraft's speed and could theoretically be used to cause a pursuing aircraft to overshoot its target. The maneuver is closely related to the famous "Pugachev's Cobra" maneuver, but the Kulbit completes the loop that the Cobra almost immediately cuts off.