The Wrights combined their wing-warping control concept and the structural design of the Chanute-Herring glider in their first aircraft, a biplane kite with a 5-foot wingspan, built in July 1899.
To allow for wing-warping, they left the kite unbraced between the front and rear struts (vertical posts). It was controlled with four lines running from the top and bottom of the front outer struts to a pair of sticks held by the operator. Tilting the sticks in opposite directions caused the wing structure to twist.
No photographs exist of the 1899 kite; only a sketch of it illustrating wing-warping, drawn by Wilbur in 1912.
This object is on display in Wright Brothers & The Invention of the Aerial Age at the National Air and Space Museum in Washington, DC.