The 1905 flyer was made stronger, more durable, and with a longer tail to provide better directional stability and control. A larger cylinder bore engine provided more power, while a more effective leading edge, and efficient propellers, improved performance. The propeller blades were made wider and thinner, while according to Harry Combs, "...adding a backward sweep to the blades, calculated precisely to avoid the pressures of flight and to keep the blades free from distortion." Other modifications included vertical rather than horizontal cylinders for its 35-horsepower engine.