Assertion: hovercraft's propeller | /r/HasProperty | enclosed in protective metal cage
Facets:
Source sentences:
text: The engine and propeller of an airboat are enclosed in a protective metal cage that prevents objects, such as tree limbs, branches, clothing, beverage containers, passengers, or wildlife, from coming into contact with the whirling propeller, which can cause traumatic injury to the operator and passengers or devastating damage to the vessel.