sentence: Designers try to make the flapping-wing flight of birds, bats, and insects seem real.
sentences_before: An 'ornithopter' from the ancient Greek language is an aircraft that flies by flapping its wings.
sentences_after: Though machines may differ in form, they are usually built on the same scale as these flying creatures. Manned ornithopters have also been built, and some have worked.
concept_name: designer
headings: Ornithopter
categories: Aircraft