Assertion: sail's angle | /r/HasProperty | maintained
Facets:
value: between 10°
type: OTHER
value: between 20°
type: LOCATION
Source sentences:
text: 7 and 8, leading spar 22 is continuously selectively rotated so that the angle of attack A° is maintained between substantially 10° and 20°, and the a push force 54 is created upon sail 20 whose longitudinal component is directed toward the bow 501 of sailing vessel 500.
text: That is, to slow down leading spar 22 is rapidly rotated so that the angle of attack A° is maintained between substantially -10° and -20°, and push force 54 is created upon sail 20 whose longitudinal component 55 is directed toward the stern 502 of sailing vessel 500 along the vessel's centerline.