The prototype of the Bulgarian LAZ-7 two-seat primary trainer of 1946 was the first post-war design to be built in Bulgaria. The LAZ-7 was matched against the Yugoslavian Aero 2.

Both the LAZ-7 and Aero 2S were powered by the Czech 160 hp Walter Minor 6-III and in the eliminating trials the LAZ-7 was successful. The decision was taken to build the LAZ-7 in series production at the Bulgarian State Aircraft Works, and to replace the Walter engine with a Russian-designed M-11FR radial driving a controllable pitch, two blade Visch V-501 prop.

The LAZ-7M production type fuselage construction is of welded steel tube and wood, and covered with fabric. Both the wing and tailplane are fully cantilever, of mixed wood and metal construction, and fabric covered. No flaps are fitted. Both the main undercarriage and tailwheel are fixed.

LAZ-7
Engine: 160 hp Walter Minor 6-III

LAZ-7M
Engine: M-11FR
Prop: controllable pitch, two blade Visch V-501
Max speed: 149 mph
Cruise: 133 mph
AUW: 2039 lb
Landing speed: 53 mph
Service ceiling: 17,220 ft
Range: 525 mi
Endurance: 3 hr 56 min
Time to 3280 ft: 4 mn 47 sec