The Stampe et Vertongen RSV.28/180 Type III,[3] also known as the RSV.28-PSV[2] (for pilotage sans visibilité, French for blind flying) was a military trainer aircraft built in Belgium to teach instrument-flying techniques.
[4][5] It was a response to a 1929 order from the Belgian Air Force,[1] whose instrument-flying certification required a flight around a 100-kilometre (62 mi) triangular course and return to a point less than 5 kilometres (3.1 mi) from the start, using instruments only.
[1] Stampe et Vertongen's response was a conventional design, a two-seat[4][5] biplane[2] fitted with a hood that could be closed over the pilot to remove visibility.
[1] Because the student pilots were also to learn to land with instruments only, the fixed undercarriage was very sturdy and had a wide track.
[1] Only one example was built,[1] but development continued with the Stampe et Vertongen ST-26 in 1932.