Assertion: rotor's axis | /r/HasProperty | aligned
Facets:
value: between the two bearings
type: OTHER
value: substantially
type: DEGREE
Source sentences:
text: In general, a rotor may spin about an axis which is aligned substantially either vertically or side-to-side (spanwise).
text: Because there are two of these spherical bearings (you can just see the second one that the lower red arrow is pointing at) the blade is constrained to only move around an axis which is aligned between the two bearings.