06/30/2014. Remarks by Walter van Tilborg: "The M.3 Bonzo was another light plane design of Automobilove Zavody Mráz (former Beneš-Mráz company) and more or less a slightly larger derivative of the M.2 Skaut. The aircraft again was designed by Zdened Rublic and the design was based on the Šokol airframe, but had a larger cabin for four persons and a lower rear fuselage with clear view cockpit canopy.

Fitted with an 160 hp Walter Minor 6-III engine, the prototype was first flown in April 1948, it remained active till 1969, mainly being used for training and geophysical survey work. No production took place, but the M.3 formed the basis for the L-40 Meta-Šokol)."

Span: 34 ft 9 in (10.50 m)
Length: 25 ft 4 in (7.72 m)
Height: 7 ft 4.5 in (2.25 m)
Wing area: 148.5 sq.ft (13.80 sq.m)
Empty weight: 1,278 lb (580 kg)
Loaded weight: 2,424 lb (1,100 kg)
Max speed: 165 mph (264 kmh)
Cruise speed: 150 mph (240 kmh)
Climb: to 3,280 ft (1,000 m) 5 min 6 sec
Service ceiling: 16,400 ft (5,000 m)
Range: 620 mls (1,000 km)