Assertion: helicopter's blade | /r/CapableOf | reduce noise generation
Facets:
value: by 50%
type: OTHER
value: compared to a tail rotor
type: OTHER
Source sentences:
text: The Fenestron has unevenly spaced blades to reduce noise generation by 50% compared to a tail rotor; this enabled an FAA Appendix H fly-over noise signature of 84.3 EPNdB, 8.5 dB below stage two limits.