Assertion: engine's efficiency | /r/HasProperty | independent of speed for jet engines
Facets:
value: for jet engines
type: OTHER
value: as a group
type: MANNER
value: roughly
type: DEGREE
Source sentences:
text: Efficiency per unit distance (per km or mile) is roughly independent of speed for jet engines as a group; however, airframes become inefficient at supersonic speeds.
text: Efficiency per unit distance (per km or mile) is roughly independent of speed for jet engines as a group; however, airframes become inefficient at supersonic speeds.