The engine is placed above the main plane and the pilot’s seat below it. The body is triangular in section, with the apex uppermost, composed of three strong bamboo poles with cross-pieces held in place by aluminum sockets, and cross braced with piano wire.
Santos-Dumont’s La Demoiselle in flight.
The motor is of the opposed type, made by Darracq, weighing only 66 pounds, and developing 30 horse-power at 1,500 revolutions per minute. The propeller is of wood, 2-bladed, and being mounted directly on the shaft of the motor, revolves at the same velocity. The speed of the Santos-Dumont machine is 37 miles per hour.
The Darracq motor and propeller of the Santos-Dumont machine. The conical tank in the rear of the pilot’s seat holds the gasoline.
The lateral balance is preserved by a lever which extends upward and enters a long pocket sewed on the back of the pilot’s coat. His leaning from side to side warps the rear edges of the wings at their tips. The elevator is moved by a lever, and the rudder by turning a wheel.
While this machine has not made any extended flights, Santos-Dumont has travelled in the aggregate upward of 2,000 miles in one or another of this type.
The plans, with full permission to any one to build from them, he gave to the public as his contribution to the advancement of aviation. Several manufacturers are supplying them at a cost much below that of an automobile.
