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2. Ray-Ban - Wikipedia

   en.wikipedia.org/wiki/Ray-Ban

   In the 1980s the Ray-Ban Clubmaster was added to the model line. [12] The Clubmaster has a browline frame and went on to become the third best selling sunglasses style of the 1980s, behind the Wayfarer and Aviator. [13] In 2007, Luxottica Group launched Ray-Ban Youth, a collection of prescription eyewear aimed at children ages eight through twelve.

3. Trijet - Wikipedia

   en.wikipedia.org/wiki/Trijet

   One of the first trijets was the Boeing 727 airliner. A similar one to this was intentionally crashed for a show.. A trijet is a jet aircraft powered by three jet engines.In general, passenger airline trijets are considered to be second-generation jet airliners, due to their innovative engine locations, in addition to the advancement of turbofan technology.

4. Timeline of jet power - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_jet_power

   The British order a single-engined jet design from de Havilland; July 18, 1942: The Messerschmitt Me 262, the first jet-powered fighter aircraft, flies for the first time under jet power. July: Frank Whittle visits the United States to help with General Electric's efforts to build the W.1. The engine is running soon after, known as the "General ...

5. Allison J33 - Wikipedia

   en.wikipedia.org/wiki/Allison_J33

   Allison J33. The General Electric/Allison J33 is an American centrifugal-flow jet engine, a development of the General Electric J31, enlarged to produce significantly greater thrust, starting at 4,000 lbf (18 kN) and ending at 4,600 lbf (20 kN) with an additional low-altitude boost to 5,400 lbf (24 kN) with water-alcohol injection.

6. GTRE GTX-35VS Kaveri - Wikipedia

   en.wikipedia.org/wiki/GTRE_GTX-35VS_Kaveri

   The DRDO assigned the lead development responsibility to its Gas Turbine Research Establishment (GTRE), which had some experience in developing jet engines. It had developed the GTX37-14U after-burning turbojet, which first ran in 1977, and was the first jet engine to be designed entirely in India. [3] A turbofan derivative, the GTX37-14UB ...

7. Engine balance - Wikipedia

   en.wikipedia.org/wiki/Engine_balance

   Engine balance. Engine balance refers to how the inertial forces produced by moving parts in an internal combustion engine or steam engine are neutralised with counterweights and balance shafts, to prevent unpleasant and potentially damaging vibration. The strongest inertial forces occur at crankshaft speed (first-order forces) and balance is ...