Assertion: airfoil's thickness | /r/CapableOf | locate up to 50% chord
Facets:
value: downstream
type: MANNER
Source sentences:
text: The supercritical airfoils were suggested first in Germany in 1940, when K. A. Kawalki at Deutsche Versuchsanstalt für Luftfahrt Berlin-Adlershof designed airfoils characterised by elliptical leading edges, maximal thickness located downstream up to 50% chord and a flat upper surface.