Editing Engine turning (section)

===Aircraft===
[[File:Fokker EII WNr 257.jpg|thumb|A [[Fokker E.II]] of late 1915, with "dragged" engine turning on the engine cowl and associated sheet metal.]]
''{{Lang|fr|[[Perlée]]}}''-style engine turning was used on the sheet metal panels of the engine [[cowling]] (nose) of [[Charles Lindbergh]]'s aircraft, the ''[[Spirit of St. Louis]]''.

The sheet metal parts of the World War I [[Fokker Eindecker|Fokker ''Eindecker'' fighters]] aircraft series, especially around the engine cowl and associated sheet metal, are noted for having a "dragged" form of engine turning entirely covering them. The tool creating the "swirls" was repeatedly moved along a short, irregular path each time while pressed against the metal, to create the intricate appearance that was characteristic of the aircraft's sheet-metal parts. It is partly surmised to have been a mechanical method to "clad" a [[duralumin]]-alloy sheet-metal panel with a layer of pure aluminum, for corrosion protection.{{citation needed|date=October 2022}}