[1] Its 110 kW (150 hp) five cylinder Hispano-Suiza 5Q radial engine (a licence-built Wright R-540) was mounted in the nose within a narrow-chord cowling.

Behind it the fuselage was flat-sided, constructed from panels linked by frames which left the interior free of cross-bracing.

The well-appointed cabin was 3.16 m (10.4 ft) long with two seats in tandem, fitted with dual controls, and a luggage space behind.

[3] It is unusual for an unflown prototype aircraft to be the first prize in a lottery but in April 1934 the MB.141 was donated by Marcel Bloch to the Ecole Nationale Supérieure de l'Aéronautique.

[1] The lottery was advertised in the French aviation press[4] and drawn on 22 July 1934; the winning ticket was announced at the end of August.