Handley Page Type D
The Handley Page Type D or H.P.4 was a single-seat, single-engined tractor monoplane, the first Handley Page design to fly for more than a few hops. Only one was built. Development The Type D was the third and last of Handley Page's early single-seat monoplanes (the Type B being a biplane). It was a close relative of the Type A, which crashed on its first turn, and the Type C which did not fly at all. Like them the Type D used the wing patented by José Weiss that promised, but failed to deliver, automatic lateral stability. Its structure was based on a rigid inner section, built with four spars and standard ribs with a flexible outer section carried on ribs attached fanwise from the end of the spars in a bird-like fashion. The wing was braced by wires from a tall, narrow inverted V kingpost, lifting loads being carried by symmetrical bracing to a matching V post under the fuselage. This latter structure also carried the two-wheel single axle undercarriage and a long central skid to prevent nosing over and to hold the tail clear of the ground. After the Type A crash, Handley Page had added wing warping