Assertion: fanjet | /r/CapableOf | retain an efficiency edge
Facets:
value: at low supersonic speeds
type: MANNER
value: over pure jets
type: OTHER
Source sentences:
text: Turbofans retain an efficiency edge over pure jets at low supersonic speeds up to roughly Mach 1.6 (1,960.1 km/h; 1,217.9 mph).