Assertion: flipper's portion | /r/CapableOf | remain propulsive
Facets:
value: by virtue of the reaction force
type: CAUSE
value: slightly
type: DEGREE
Source sentences:
text: By virtue of the reaction force exerted by the water, this portion of the fin remains only slightly propulsive during the descending movement of the swimmer's leg when the maximum propulsive effect is needed most.