Assertion: airfoil's surface | /r/HasProperty | upper
Facets:
Source sentences:
text: The theory states that airfoils are shaped with the upper surface longer than the bottom.
text: the airfoil has an upper surface 72 that increases in convexity from the root or fuselage end, to the wing tip, FIG. 7.
text: The theory states that airfoils are shaped with the upper surface longer than the bottom.
text: {Lifting airfoils are designed to have the upper surface longer than the bottom.}
text: {Lifting airfoils are designed to have the upper surface longer than the bottom.}