The
Wrights' third glider was the world's first aircraft with 3-axis control and was the basis
for the Wrights' first pioneer "flying machine" patent. Used on all Wright
aircraft through 1905, a novel hip cradle controlled roll axis via helicoidal wing warping
in combination with rear rudder deflection for yaw control producing coordinated flight.
Wrights flew their third glider at Kitty Hawk almost 1,000 times during Sep-Oct 1902, with
flights up to 622 feet and durations of up to 26 sec. This biplane had 32-foot span;
0.33-foot anhedral; 5-foot chord; 4.6-foot separation; 305 sq-foot area; 1/24-1/30 camber;
15 sq-foot horizontal rudder; 16.1-foot overall length; and weighed 112 lb. Originally, it
had twin fixed vertical 11.7 sq-foot rear rudder. On 6 Oct 1902, they replaced the double
rudder with a single movable rudder with 5.7 sq-foot area.
Stored at Kitty Hawk over the winter, they used this glider for practice in 1903 while
building the powered airplane, replacing the single vertical rudder with a double one,
whereon Wilbur made one glide lasting 43 seconds.
References:
 | McFarland, 1953, p 1185-7, drawing 1186, plates 39-52, 56-59, 62. |
 | McFarland, Marvin W. (ed) The papers of Wilbur and Orville Wright. McGraw-Hill
Book Co., New York, 1953, p 1185-7; drawing 1186, plates 39-52, 56-59, 62. |
[Submitted by Joe W. McDaniel] |

The 1902 glider was the first Wright flying machine to have a vertical rudder
(behind). At first, the rudder was only a fixed tail with twin vanes, unable to move. The
Wrights found this caused them grief when they tried to turn.
They modified the fixed tail, removing a vane and mounting the remaining one so
it could pivot right and left. For the first time, they were able to make turns safely.

In 1903, while they were readying their powered Flyer 1, the Wrights modified
the tail of the 1902 glider again, adding a second movable vane. They practiced with this,
hoping it would handle more like the Flyer.
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