06
Nov
2008
Posted by admin as aircraft
The Beechcraft Bonanza is an American general aviation aircraft introduced in 1947 by The Beech Aircraft Corporation. As of 2008 it is still being produced in derivative form by Hawker Beechcraft. More than 17,000 Bonanzas of all variants have been built.
At the end of World War II two all-metal aircraft emerged, the Bonanza H Model 35 and the Cessna 195 aircraft, that represented very different approaches to the premium-end of the postwar civil aviation market. With its high wing, seven-cylinder radial engine, fixed tailwheel undercarriage and roll-down side windows, the Cessna 195 was little more than a continuation of prewar technology; the 35 Bonanza, however, was more like the fighters developed during the war, featuring an easier-to-manage horizontally-opposed six cylinder engine, a rakishly streamlined shape, retractable nosewheel undercarriage and low-wing configuration.
Designed by a team led by Ralph Harmon, the Bonanza H model 35 aircraft was the first truly modern high-performance personal aircraft. It was a very fast, low-wing monoplane at a time when most light aircraft were still made of wood and fabric. The Model H 35 featured retractable landing gear and its signature V-tail (equipped with a combination elevator-rudder called a ruddervator), which made it both efficient and the most distinctive private aircraft in the sky. The prototype 35 Bonanza made its first flight on 22 December 1945, with the first production aircraft debuting as 1947 models. The first 30-40 Bonanzas produced had fabric-covered flaps and ailerons, after which those surfaces were covered with magnesium alloy sheet.
A series of fatal accidents caused many to suspect flaws in the V-tail structural design. A study by Beech concluded that the cause was primarily use of the Bonanza for long-distance travel in all types of weather, and that the inflight breakups were mainly the result of excursions into extreme turbulence (as might be found in thunderstorms), not any inherent flaw in the design. Other types, such as the Cessna 210, that were similarly employed did not have the same breakup rate as the Bonanza, and a more likely explanation was that the leading edges of the stabilizers were cantilevered too far ahead of the main spars. FAA issued two Airworthiness Directives covering the V-tail. The first (AD 2002-21-13) applied only to the earliest 35, A35, and B35 models built in 1947 to 1950, and mandated a detailed inspection and repair procedure. The second (AD 94-20-04 R2) required a one-time inspection of the empennage structure, reinforced the need for correct balancing of the control surfaces and tensioning of the cables, and included the installation of a cuff securing the leading edge of the stabilizers to the fuselage skins.
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