Assertion: centerboard | /r/CapableOf | swing up to useful 42of draft
Facets:
value: from 7' 9"
type: OTHER
Source sentences:
text: Below the waterline most boats have the centerboard option which entails a long and shallow fin keel, with a centerboard that swings up from 7' 9" to a useful 4' 2" of draft in shoal waters.