Wright 1904 Flyer

Glenn Research Center

This page shows a computer drawing of the Wright brothers' 1904 aircraft. This machine was the second powered aircraft built by the brothers. The forces acting on this aircraft are identical to the forces which act on any modern aircraft. Following the successful first flights at Kitty Hawk on December 17, 1903, the brothers returned to Dayton, Ohio. On each of the four flights of that day, the 1903 aircraft exhibited an instability in pitch: the nose, and consequently the entire aircraft, would slowly bounce up and down. On the last flight, hard contact with the ground broke the front elevator support.

The brothers decided to build a new aircraft for 1904 with the same basic design of the 1903 flyer. You can study the design of the 1904 aircraft by changing the view using the buttons at the bottom of this Java program.

You can download your own copy of this applet by pushing the following button:

The program is downloaded in .zip format. You must save the file to disk and then "Extract" the files. Click on "1904.html" to run the program off-line.

They built a new engine similar to the 1903 engine but increased the power from 12 horsepower to 18 horsepower by slightly increasing the bore (diameter of the piston). They also built a new airframe with redesigned rudders. The new aircraft was to be flown from a cow pasture owned by Torrence Huffman and located just outside Dayton.

Here is a photo taken in 1904 at Huffman Field:

Without the winds of Kitty Hawk, it was a problem getting enough airspeed to fly. So the brothers devised a catapult system to help launch the aircraft. Once airborne, the aircraft experienced the same pitch problems as the 1903 aircraft. In an effort to solve the problem, they moved the radiator and fuel tank from the front struts to the rear struts and moved the engine slightly aft to move the aircraft center of gravity aft. But this only made the pitch problem worse. So the brothers added 70 pounds of iron bars as ballast to the front elevator to move the center of gravity farther forward. The weight of the aircraft then increased to about 900 pounds with the pilot. The ballast improved the handling of the aircraft and Wilbur was able to complete the first circuit of the airfield on September 20, 1904.

Here is a photo taken of the aircraft in flight in 1904:

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