Assertion: glider's lift | /r/HasProperty | understood as upward reaction
Facets:
value: physically
type: MANNER
Source sentences:
text: "The lift produced by a finite-span airfoil, such as a plate for example, or an airplane wing, can physically be understood as the upward reaction to a downward deflection of a tube or cylinder of fluid having a diameter equal to the span of the lifting element.