The Akaflieg München Mü18 Meßkrähe is a glider that was designed and built in Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 in 1927

Development

Initiated by the RLM (Reichsluftfahrministerium – Reich Aviation Ministry), the Mü18 "Meßkrähe" was an experimental

Experimental aircraft

An experimental aircraft is an aircraft that has not yet been fully proven in flight. Often, this implies that new aerospace technologies are being tested on the aircraft, though the label is more broad....

 flying wind-tunnel used to research aerofoil sections in undisturbed airflow.
With the airframe designed and built at Akaflieg München, test aerofoil sections were provided by Akaflieg Chemnitz, Akaflieg Danzig and Akaflieg Göttingen. Test sections were suspended, in undisturbed airflow on an adjustable trapeze, for measurement of pressure distribution at various angles of attack. Progress on the glider was slow due to a very low priority for resources, but the Mü18 "Meßkrähe" eventually flew towards the end of WWII.