Diverterless supersonic inlet

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Diverterless supersonic inlet
F-35 Divertless Supersonic Inlet F-16.jpg
Testing of the F-35 Diverterless Supersonic Inlet on an F-16 testbed. The original intake is shown in the top image.

A diverterless supersonic inlet (DSI) is a type of jet engine air intake used by some modern combat aircraft to control air flow into their engines. It 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 DSI can be used to replace conventional methods of controlling supersonic and boundary layer airflow. DSI's have been tested on F-16's for speeds of up to Mach 2 and can be used to replace the intake ramp and inlet cone, which are more complex, heavy and expensive.[1]

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 (Mach 2.0 is the F-16's clean certified maximum speed) 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.[1]

List of Aircraft with DSI[edit]


  1. ^ a b Hehs, Eric (15 July 2000). "JSF Diverterless Supersonic Inlet". Code One magazine. Lockheed Martin. Retrieved 11 February 2011. 
  2. ^ "歼-10B改进型". AirForceWorld.com. 
  3. ^ "JL-9 Trainer Jet gets DSI inlet, Guizhou China". AirForceWorld.com. Retrieved 29 Aug 2011. 
  4. ^ "Paris Air Show 2011 - Naval air trainer unveiled by Chinese media". home.janes.com, 15 February 2012.

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