The “Clément-Bayard”
The “Ville de Paris”
Rudders and Planes
The dirigible has thus several air-resisting or gliding surfaces. The approximately “horizontal” (actually somewhat inclined) planes permit of considerable ascent and descent by the expenditure of power rather than gas, and thus somewhat influence the problem of altitude control. Each of the four sets of horizontal rudder planes on the Zeppelin, for example, has, at thirty-five miles per hour, with an inclination equal to one-sixth a right angle, a lifting power of nearly a ton; about equal to that of all of the gas in one of the sixteen compartments.
