Assertion: turbine's blade | /r/HasProperty | 1.5 to 3.5 metres
Facets:
value: in diameter
type: OTHER
value: usually
type: TEMPORAL
Source sentences:
text: Their blades are usually 1.5 to 3.5 metres (4 ft 11 in–11 ft 6 in) in diameter and produce 1-10 kW of electricity at their optimal wind speed.