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2. S-75 Dvina - Wikipedia

   en.wikipedia.org/wiki/S-75_Dvina

   Fan Song radar (left) and a Low Blow to the right. The S-75 typically uses the P-12 early warning radar (also known by its NATO codename, "Spoon Rest"), which has a range of about 275 km (171 mi). The P-12 provides early detection of incoming aircraft, which are then handed off to the acquisition Fan Song radar. These radars, having a range of ...

3. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   Like any other fan, propeller or rotor, a ducted fan is characterised by the number of blades. The Rhein Flugzeugbau (RFB) SG 85 had three blades, while the Dowty Rotol Ducted Propulsor had seven. [3] [4] The blades may be of fixed or variable pitch. See: Fan (machine)

4. Sikorsky CH-54 Tarhe - Wikipedia

   en.wikipedia.org/wiki/Sikorsky_CH-54_Tarhe

   The Sikorsky CH-54 Tarhe is an American twin-engine heavy-lift helicopter designed by Sikorsky Aircraft for the United States Army.It is named after Tarhe, an 18th-century chief of the Wyandot Indian tribe whose nickname was "The Crane". [2]

5. Fan disk - Wikipedia

   en.wikipedia.org/wiki/Fan_disk

   Diagram of a fan disk Fan disk assembly diagram, showing one blade and attachment hardware Cross section of fan disk Failed fan disk recovered from the center engine of UAL 232. A fan disk is the central hub of a fan in a turbofan engine. Fan blades are attached to the fan disk, which is rotated by a shaft driven by a gas turbine. [1]

6. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

7. Wide chord - Wikipedia

   en.wikipedia.org/wiki/Wide_chord

   The wide chord fan on a Rolls-Royce Trent 970B- 84 installed on a British Airways Airbus A380. Wide chord describes the fan blades on certain turbofan engines that have a blade design with a specific geometry - In layman's terms, they would be described as having wider blades than other jet engines.