The Curtiss Model D Biplane was the precursor to the most popular aeroplane in the U.S. during the Pioneer Era, the Curtiss Model D Headless Biplane. The Herring-Curtiss Biplane, above, differed from the Curtiss Model D Biplane principally in the placement of the ailerons. On the Herring-Curtiss Biplane the ailerons were located on the front wing struts, whereas on the Curtiss Model D Biplane the ailerons were mounted on the rear wing struts. Detailed plans were published enabling anyone with the wherewithal and time to build a Curtiss Model D-type biplane. Perhaps the most well-known set of plans were published by Hayward in 1912. The 3-view above (which depicts the Herring-Curtiss Biplane) is taken from the Hayward instructions. By 1912 most of these machines had been rebuilt to eliminate the front surfaces altogether.