Assertion: airfoil's stall | /r/HasProperty | undesirable
Facets:
value: usually
type: DEGREE
value: except for flight training
type: OTHER
value: for the performance of wings
type: PURPOSE
value: very
type: DEGREE
Source sentences:
text: Since such stalling is very undesirable for the performance of wings, the physical nature of this type of flow separation ought to be understood.
text: Except for flight training, airplane testing, and aerobatics, a stall is usually an undesirable event.