I read a lot of posts concerning that subject, nevertheless I cannot solve to problem of getting $length in the field calculator in meters rather than in decimal degress in QGIS.
The CRS of original shapefile is WGS84 (EPSG:4326). I reprojected the shape to World Euidistance Cylindrical (Sphere) (EPSG:3786). I did the same in project settings (with on the fly transformation enabled).
However I am still getting the length of the polylines in decimal degrees. Any ideas?