BFW M.31

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BFW M.31 (also known as the Messerschmitt M.27) was a German two‑seat sport plane from 1932. It had a radial engine, a low cantilever wing, open tandem cockpits, and fixed undercarriage. Only one was built.

Willy Messerschmitt, at Bayerische Flugzeugwerke (BFW), had created a family of small low‑wing sport planes in the late 1920s and early 1930s: the M.19, M.23, M.27, M.31 and M.35. The M.23 was the best‑selling model.

The M.31 used the same wingspan as the M.23c. It was a tandem two‑seat open cockpit monoplane with a low wing and a braced tailplane. Its fuselage below the deck was more rounded, built from two long panels per side. The fixed undercarriage had no spats, unlike the M.27. It was powered by a neatly cowled radial engine with a two‑blade propeller. Some people called it the most elegant of the series.

Its first flight was in 1932, and it was shown at the Aerosport exhibition in 1933. No orders were placed, so only the prototype was built.