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2. 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]

3. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   An assembly designed throughout as a single integrated unit is referred to as a fan pod or ducted propulsor. [3] [4] An advantage of the pod approach is that the design of each component can be matched to the others, helping to maximise performance and minimise weight.

4. Variable pitch fan - Wikipedia

   en.wikipedia.org/wiki/Variable_pitch_fan

   A variable pitch fan is similar in concept to that of a variable-pitch propeller and involves progressively reducing the pitch (or blade angle) of the fan on a turbofan as the engine is throttled. Although variable pitch fans are used in some industrial applications, the focus of this article is on their use in turbofan engines .

5. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

6. 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.

7. Phrases from The Hitchhiker's Guide to the Galaxy - Wikipedia

   en.wikipedia.org/wiki/Phrases_from_The_Hitchhiker...

   The 42 puzzle orthorectified (1), and the number 42 hidden as binary (2), Hindu-Arabic numerals (3) and Roman numerals (4) The 42 Puzzle is a game devised by Douglas Adams in 1994 for the United States series of The Hitchhiker's Guide to the Galaxy books. The puzzle is an illustration consisting of 42 multi-coloured balls, in 7 columns and 6 rows.