Assertion: glider's wing | /r/MadeOf | heavy
Facets:
Source sentences:
text: When the available engine power increased during the 1920s and 1930s, wings could be made heavy and strong enough that bracing was not needed anymore.
text: When the available engine power increased during the 1920s and 30s, wings could be made heavy and strong enough that bracing was not needed any more.