Assertion: hang glider's wing | /r/HasAspect | double surface
Facets:
value: over their entire area
type: LOCATION
Source sentences:
text: The wings of high performance gliders have double surface over nearly their entire area, to closely match the designs of aircraft/sailplane wings, but to maintain this internal volume and shape, much more sail battens (perhaps 30) are required, compared to lower performance gliders (e.g. 18 on an intermediate, 10 on a novice glider).