 The American Jacobs L-4M engine was used to replace the Walter Regulus during the winter of 1939-1940.In all the M.F.8 design was very successful, with the pilots of the RNNAS receiving their first training on it up until the German invasion of Norway, the last of the type having been delivered in October 1935.Plans to replace it with a version of the Army's Tiger Moth trainer equipped with floats failed when tests in 1934 showed that the Tiger Moth was of little value as a seaplane.