02/28/2010. Remarks by Johan Visschedijk: "Ferdinand Ferber's aircraft No. IX appeared in July 1908, it was a biplane with a bamboo framework, and had provision for warping the wings, as in the Wright aircraft of that time. It also had a Wright derived forward elevator, a vertical rudder for steering, and was fitted with a 50 hp Antoinette engine. It was first flown on August 12, and a week later made some good hop-flights up to 1,641 ft (500 m). It was not very successful, but it helped to focus attention on the tractor biplane as such."