The jet engine Sir Isaac Newton discovered the jet principles in the 18th century. This was base on the theory that "to every action there is an equal and opposite reaction" (third law of Newton). But it is only in the 1930 that the idea to build a jet engine appeared. This was happening in England with Sir Frank Whittle and in Germany with Dr. Hans von Ohain. Sir Frank Whittle had the first patent of …showed first 75 words of 542 total…

…showed last 75 words of 542 total…to the latest design of the multi spool fan engines with high bypass ratio. (Ref pictures in Annexe) Those developments had a huge impact on air travel in the recent years, driving the cost of operating down therefore increasing air travel. The future trends of the developments are concentrating now on environmental issues such as ways to improve fuel consumption and reduce noise, very far from the original idea of permanently wanting to go faster.