The Praga B2 was a low powered aero engine suitable for very light aircraft.

The Praga B2 was a dual ignition, air-cooled horizontal twin producing 40 horsepower (30 kW) aimed at lightweight aircraft.

[1] It was a higher compression version (6.7:1 from the earlier 5.72:1) of the original and otherwise very similar Praga B,[2] which provided 36 hp (27 kW).

[2] Jowett Cars Ltd. of Idle, Bradford in the UK obtained a licence in 1936 to build the Praga B engine, for installation into the licence built Hillson Praga.

Immediately after the end of World War II the Praga B2 was on display at the 1946 Paris Air Show.