prototype, designated as the Bloch 150-01, commenced. Although the C.1 competition was ultimately won by a rival design, the Morane-Saulnier M.S.406, it was decided to independently continue with the design's development. During 1936, these efforts culminated in the first attempted flight of the MB.150.01 prototype; unfortunately, the aircraft proved unable to leave the ground during the attempt. In the ensuing disappointment work on the design was temporarily halted, but development was resumed during early 1937. Following the implementation of various modifications, consisting of a strengthened wing of greater area, revised undercarriage arrangement and the installation of a Gnome-Rhone 14N-0 radial engine with a three-blade constant speed propeller, on 29 September 1937, the MB.150 finally conducted its maiden flight. Months later, the MB.150.01 was handed over to the Centre d'Essais du Materiel Aerien (CEMA) for service trials; during one such official test flight in December 1937, a maximum recorded speed of 434 km/h (269 mph) was attained. As a result of the CEMA flights, the prototype's performance proved to be sufficiently interesting as to warrant further development. This brought, at the beginning of 1938, a small increase in the aircraft's wing span, the replacement of the twin wing-mounted radiators by a single unit installed between the wheel wells, and the installation of an improved 14N-7 engine, which led to the prototype being re-designated as the MB.150.01M (M standing for modified). During spring 1938, further trials of the modified aircraft were performed by CEMA. By this point, wider circumstances within France, such as the declining diplomatic situation between the European powers and the enactment of several urgent re-equipment programmes for the French Air Force, proved favourable for the MB.150. Specifically, on 15 March 1938, one such programme, referred to as Plan V, was adopted, calling for the near-unrealistic delivery of 940 modern fighter aircraft to the Air Force within the space of a year. Even the most optimistic projections saw 285 M.S.406 fighters delivered; while the MB.150 was deemed to have not yet completed development, it was decided to include the type within the production. Accordingly, on 7 April 1938, upon the completion of trials in late spring 1938, the newly formed manufacturing consortium SNCASO received an initial order for a pre-production batch of 25 aircraft which, upon successful completion of the MB.150's development programme, was followed by the confirmation of a sizable order for 450 aircraft. Initially, 300 aircraft were to