The BFW M.20 (also known as the Messerschmitt M.20 after the designer's surname) was a German single-engine, high-wing

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...

ten-seat passenger transport aircraft, developed in the late 1920s and early 1930s.

Deutsche Luft Hansa ''Deutsche Luft Hansa A.G.'' (from 1933 styled as ''Deutsche Lufthansa'' and also known as ''Luft Hansa'', ''Lufthansa'', or DLH) was a German airline, serving as flag carrier of the country during the later years of the Weimar Republic and th ...

used it throughout the 1930s on a variety of routes.

Design and development

The M 20 was designed by

Willy Messerschmitt Wilhelm Emil "Willy" Messerschmitt (; 26 June 1898 – 15 September 1978) was a German aircraft designer and manufacturer. In 1934, in collaboration with Walter Rethel, he designed the Messerschmitt Bf 109, which became the most important ...

at Bayerische Flugzeugwerke, primarily for use with Luft Hansa which had ordered two in advance of the first flight. It was a development of the BFW M.18d eight-seater, equipped with a single 375 kW (500 hp) upright inline water-cooled

BMW VI The BMW VI was a water-cooled V-12 aircraft engine built in Germany in the 1920s. It was one of the most important German aero engines in the years leading up to World War II, with thousands built. It was further developed as the BMW VII and B ...

a engine. It had a high,

cantilever A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a canti ...

wing based around a robust D-section box formed from a single

dural Dural is a suburb of Sydney, in the state of New South Wales, Australia 36 kilometres north-west of the Sydney central business district in the local government areas of Hornsby Shire and The Hills Shire. Dural is part of the Hills District. ...

spar SPAR, originally DESPAR, styled as DE SPAR, is a Dutch multinational that provides branding, supplies and support services for independently owned and operated food retail stores. It was founded in the Netherlands in 1932, by Adriaan van Well, ...

and dural skin, forward to the

leading edge The leading edge of an airfoil surface such as a wing is its foremost edge and is therefore the part which first meets the oncoming air.Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', page 305. Aviation Supplies & Academics, ...

. The

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...

was all-metal, with a mostly dural frame, covered with metal sheeting providing rectangular cross-section accommodation, with four square windows each side, for eight passengers. The single-axle main

undercarriage Undercarriage is the part of a moving vehicle that is underneath the main body of the vehicle. The term originally applied to this part of a horse-drawn carriage, and usage has since broadened to include: *The landing gear of an aircraft. *The ch ...

was strutted vertically to the wing. The aircraft made its maiden flight on 26 February 1928, but was lost when pilot Hans Hackmack bailed out at low altitude and was killed, after the surface stripped from part of the wing. A second M.20 was flown on 3 August 1928, and became the first of two M.20a series to fly with Luft Hansa. Encouraged by their performance, Luft Hansa ordered 12 more, enlarged, M.20b aircraft. These carried ten passengers in a fuselage with five windows each side. It had dihedral on the wing and a more rounded

vertical tail A vertical stabilizer or tail fin is the static part of the vertical tail of an aircraft. The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, sta ...

Operational history

The Luft Hansa M.20s entered service in 1929 on routes that went from

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

via Germany to the

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

and from Stuttgart via

Marseille Marseille ( , , ; also spelled in English as Marseilles; oc, Marselha ) is the prefecture of the French department of Bouches-du-Rhône and capital of the Provence-Alpes-Côte d'Azur region. Situated in the camargue region of southern Franc ...

Barcelona Barcelona ( , , ) is a city on the coast of northeastern Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second most populous municipality of Spain. With a population of 1.6 million within ci ...

. From the mid-1930s, they were operating German internal and holiday routes. Two were still flying such routes in 1942. One former Luft Hansa airframe went to Brazil in 1937, flying with

Varig VARIG (acronym for Viação Aérea RIo-Grandense, ''Rio Grandean Airways'') was the first airline founded in Brazil, in 1927. From 1965 until 1990, it was Brazil's leading airline, and virtually its only international one. In 2005, Varig went ...

as ''PP-VAK'', until it crashed on 7 March 1948, the only M.20 to survive the war

The Messerschmitt-Milch relationship

Hans Hackmack, who died in the first flight of the M 20, was a close friend of

Erhard Milch Erhard Milch (30 March 1892 – 25 January 1972) was a German general field marshal (''Generalfeldmarschall'') of Jewish heritage who oversaw the development of the German air force (''Luftwaffe'') as part of the re-armament of Nazi Germany foll ...

, the head of Luft Hansa and the German civil aviation authorities. Milch was upset by the lack of response from Messerschmitt and this led to a lifelong hatred towards him. Milch eventually cancelled all contracts with Messerschmitt and forced BFW into bankruptcy in 1931. However, the German rearmament programs and Messerschmitt's friendship with

Hugo Junkers Hugo Junkers (3 February 1859 – 3 February 1935) was a German aircraft engineer and aircraft designer who pioneered the design of all-metal airplanes and flying wings. His company, Junkers Flugzeug- und Motorenwerke AG (Junkers Aircraft and Mo ...

prevented a stagnation of the careers of himself and BFW, which was started again in 1933. Milch still prevented Messerschmitt's takeover of BFW until 1938, hence the designation "Bf" of early Messerschmitt designs.

Variants

;M.20a : The first two eight-seater aircraft for Luft Hansa. ;M.20b : Twelve ten-seaters built for Luft Hansa. ;M.20b-2 : Upgraded with a 480 kW (640 hp) BMW VIu engine.

Operators

;: *

Luft Hansa ''Deutsche Luft Hansa A.G.'' (from 1933 styled as ''Deutsche Lufthansa'' and also known as ''Luft Hansa'', ''Lufthansa'', or DLH) was a German airline, serving as flag carrier of the country during the later years of the Weimar Republic and th ...

; *

Specifications (M.20b)

BFW_M_20_3-view_Aero_Digest_February_1929

References

{{DEFAULTSORT:Bfw M.20 1920s German airliners M 20