Take the body of a small plane with stubby wings. Replace the wheels with heavy-duty helicopter skids, add four buzzing dronelike electric fans to each one, and you’ll have something like Boeing’s ...

THE “To-day and To-morrow” series has a reputation of brilliance and provocativeness. Mr. Oliver Stewart's account of the future of the flying machine amply maintains this reputation. The writing is ...

Leif Ristroph wanted to build the “simplest possible” flying machine. The applied mathematician at New York University glued together several tubes of carbon fiber to build this: a sphere with four ...