Task: Question Generation
Input (English): Many 1:18 scale automobiles are over 11 inches long, while 1:18 aircraft may reach over 3 feet in length. 1:18 models often include many intricate details and moving parts not commonly found on models in smaller scales. 1:18 model cars are available as kits, where the enthusiast builds the model from start to finish.
Output (English): 1:18 scale is how big?