Assertion: airfoil's drag | /r/CapableOf | necessitate a sweeping of the wing
Facets:
value: to combat the transonic drag rise
type: PURPOSE
Source sentences:
text: We also discussed the aspect ratio and how a longer, thinner wing will reduce the total drag of the wing up to a particular speed; whereafter transonic speed effects begin to dominate the total drag produced which necessitating a sweeping of the wing to combat the transonic drag rise.