The B.5 is a typical biplane sport/trainer aircraft of the period. Its upper wing is staggered forward of the lower wing. The lower wing attaches to the lower fuselage between the two cockpits; the upper wing is a one-piece unit over the fuselage. Only the upper wing has ailerons. The wings are connected with struts.
The fixed undercarriage used an axle between the two wheels, and a tailskid.
The empennage was conventional, with the tailplane affixed to the top of the tailcone.
The engine was a NAG four-cylinder inline piston engine, rated at 40 hp. It turned a two-blade wooden propeller. Rotation was counterclockwise as viewed from the cockpit.