05/31/2009. Remarks by Kees Kort: "This was the third machine designed by Louis Blériot and built by the Voisin Brothers, as the Type I was a product solely of Blériot. The Voisins had a factory where they built their own designs, but they also built machines from other designers.
The Type IV was finished as a twin-float plane, powered by two 24 hp Antoinette engines driving pusher propellers. The floatplane was tested on October 18, 1905 but was not able to liftoff from the water. Subsequently the machine was fitted with wheels and it was retested on November 12, 1905, again unsuccessful, as the machine was wrecked when crossing a gutter. This ended the Blériot collaboration with Voisin and this form of machine was not further developed by Blériot.
In those early times machines were continually modified. Visible in the picture, small ailerons were fitted between the wings, a new experiment of Blériot. Blériot continued to develop new models at a high speed but most of them were unsuccessful till the Type XI, which was at least partly designed by the young engineer Raymond Saulnier, later well-known by the famous Morane-Saulnier machines.