Sir Nigel Gresley of the LNER became a proponent when he incorporated double Kylchap exhausts into four of his A4 Pacifics, including the world speed record holder Mallard.
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The Kylchap was not the only advanced steam locomotive exhaust: another design, the Lemaître, had some success in France and England; noted Argentinian engineer Livio Dante Porta designed several, the Kylpor, Lempor and Lemprex designs; and several U.S. railroads including the Norfolk & Western used a concentric nozzle known as the waffle iron exhaust.
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The Kylchap steam locomotive exhaust system was designed and patented by French steam engineer André Chapelon, using a second-stage nozzle designed by the Finnish engineer Kyösti Kylälä and known as the Kylälä spreader; thus the name KylChap for this design.
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Arthur Peppercorn's post-war LNER Pacifics also incorporated them, including preserved A2 532 Blue Peter, and the recreated A1 Tornado has one.
Kylchap |
Later the French engineer André Chapelon, developed and improved the invention by using a second-stage nozzle and adopted the name Kylchap for this design.
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Kylchap exhausts are found on many French and British locomotives notably the Flying Scotsman and the world record holding Mallard.
(The Kylchap was named so due to the names of its creators, Kylälä and Chapelon.)