 The first aircraft were delivered with Scania-Vabis engines, which proved too weak and was replaced with Beardmore or Sunbeam engines.For the next two aircraft produced the Royal Norwegian Navy Air Service (RNNAS) settled on a Mercedes engine and aircraft with this engine were redesignated as M.F.8Bs.However, in 1932 Marinens Flyvebaatfabrikk had to find a replacement for the Mercedes engines as spare parts became hard to procure.