Assertion: blackbird | /r/HasProperty | sponsored by google
Facets:
value: to demonstrate
type: PURPOSE
Source sentences:
text: Blackbird is an experimental land yacht, built by Rick Cavallaro and John Borton of Sportvision, sponsored by Google and Joby Energy in association with the San Jose State University aeronautics department to demonstrate that it is possible to sail directly downwind faster than the wind.