Blohm & Voss BV-141

The Blohm & Voss BV 141 was an unorthodox, asymmetrical German tactical reconnaissance aircraft developed during WWII (first flight 1938). Designed for superior visibility, it featured a, offset crew nacelle but was never mass-produced, losing out to the Focke-Wulf Fw 189, partly due to engine shortages for its BMW 801 engine and political, rather than technical, reasons. 
 
Key Aspects of the BV-141:
Design & Purpose: To solve poor visibility in traditional scout planes, designer Richard Vogt created an asymmetrical layout with the crew in a glazed, separate nacelle on the starboard side, and the engine/boom on the port side.
Performance: Despite its odd, "lopsided" appearance, the BV 141 flew remarkably well, demonstrating good stability and maneuverability, and a top speed of roughly 248 mph.
Operational History: Approximately 28 prototypes and test aircraft were built, but it never entered full combat service.
Why it Failed: The Focke-Wulf Fw 189 was chosen for production as it was more conventional, easier to build, and did not require the BMW 801 engine, which was urgently needed for the Fw 190 fighter. However it is still very cool looking.