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Blohm & Voss BV 141

The Blohm & Voss BV 141 was an unorthodox tactical reconnaissance aircraft developed by the German aircraft manufacturer Blohm & Voss. It was notable for its uncommon structural asymmetry.

Development
Background During the mid-to-late 1930s, efforts were underway to develop and construct suitable aircraft to equip the rapidly growing Luftwaffe. To this end, during 1937, the Reichsluftfahrtministerium (RLM/German Aviation Ministry) issued a specification that called for a single-engine reconnaissance aircraft that would succeed the Henschel Hs 126. Stipulations included the use of a single engine (this was intended to reduce maintenance requirements in the field), accommodation of a three-man crew, and the possession of favourable all-round visual characteristics superior to that typically offered by parasol wing aircraft such as the Hs 126. A single-engined shoulder-wing monoplane, the Ar 198 featured an enlarged glazed central fuselage position to facilitate good external visibility. However, the Ar 198 prototype proved to be unsatisfactory during flight testing. In terms of its general configuration, the aircraft's single engine was directly attached to the forward end of the tail boom while the crew were seated with a Plexiglas-glazed gondola; the tailboom and gondola were connected via the wing. Although Ernst Udet of the Technical Department of the RLM was interested in the BV 141, several other key figures within the RLM did not look favourably upon Blohm & Voss's submission, and ultimately the RLM declined to fund its development. Not dissuaded by this unenthusiastic reception, the company elected to self-finance the construction of a single prototype, initially designated as the Ha 141-0. Into flight On 25 February 1938, the Ha 141-0 performed its maiden flight; it was quickly determined to possess relatively few problems. Encouraged by the favourable performance of BV 141 V3, the RLM placed an order for a further five preproduction aircraft, the first of which started flying during early 1939. During January 1940, this version of the aircraft, designated BV 141A, underwent an official evaluation at E-Stelle Rechlin that concluded favourably. However, on 4 April 1940, the RLM decided that the aircraft was underpowered, although it was also noted that it had otherwise exceeded the requirements, leading to production plans being cancelled. By the time a batch of 12 BV 141Bs were built with the BMW 801 engine, they were too late to make an impression, as the RLM had already decided to put the Fw 189 into production. Furthermore, an urgent need for BMW 801 engines to power the Fw 190 fighter aircraft reduced the chance of the BV 141B being produced in quantity. Vogt came up with several other asymmetric designs, including the piston-jet P.194.01, but none of those were actually built. Several wrecked BV 141s were found by advancing Allied forces. One aircraft was captured by British forces and sent to England for examination. No examples survive today. ==Design==
Design
All three crew (pilot, observer and rear gunner) of the BV 141 was seated within a gondola, which was extensively glazed with Plexiglas. This gondola was positioned on the starboard side of the engine and strongly resembled that found on the Fw 189. The fuselage was located on the port side and led smoothly from the BMW 132N radial engine to a tail unit. At first glance, the placement of weight would have induced tendency to roll, but the weight was evenly supported by lift from the wings. In terms of thrust vs drag asymmetry, the countering of induced yaw was a more complicated matter. At low airspeed, it was calculated to be mostly alleviated because of a phenomenon known as P-factor, while at normal airspeed it proved to be easily controlled with trimming. The tailplane was symmetrical at first, but in the 141B it became asymmetrical – starboard tailplane virtually removed – to improve the rear gunner's fields of view and fire. The displaced center of gravity was accounted for through a combination of propeller torque and the specific arrangement of the outer wing areas, ==Variants==
Variants
All 20 of the BV 141Bs that were ordered were produced and delivered. Prototypes ;Ha 141-0 : D-ORJE; original designation of the first aircraft completed with the stepped cockpit nacelle. Became the BV 141 V2. ;BV 141 V1 : WNr 141-00-0171; D-OTTO then BL+AU, damaged • WNr 0210020; GL+AH; rebuilt D-OLLE ==Specifications (BV 141B-02 [V10])==
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