This company was formed from the merger of Breitfeld-Danek and Ceskomoravska-Kolben. As it is located in Prague, its engines are sometimes named as "Praga" as well.

-The first engines were a V-8 that gave 100 CV and a V-12 giving 150 CV.

"V-12, 150 CV"

-Though we are skipping the order, we give a production overview. Throughout the publication some of these engines appear, but with another reference like "Praga" CKD, Breitfeld-Danek, Danek, Kolben, etc.

"“Praga E"

-As we see, the Praga-E power transmissions are at a 90° angle. This engine drove two propellers located on the wings. A long transmissions passed along the leading edge from the fuselage to where the engine was fitted on the wing..

-The gimbal outputs that are above and below the gearbox, are used for starting. The power output was 410 CV.

"Staatsmotor"

-In 1914 they built the Staatsmotor, a seven-cylinder rotary with a special device to obtain the function of conventional valves. It was a sort of sliding sleeve valve over the cylinder head driven by the same rod that would drive a conventional valve.

-In the Le Bourget Museum reserve stock they perserve an engine of this type.

"Breitfeld-Danek Blesk"

-The "Blesk" was a six-cylinder in line with cylinders in pairs and giving 100/120 hp. Before executing this own design, Breitfeld Danek made the Hiero II and IV under license. From this experience would come the Blesk and Perun engines.

-The Perun reached 185 CV and the Perun II 240 CV.

"Perun II"

-With the Perun II cylinder blocks they made a V12 that was simply known as 12V "BD" 500 CV, but it could deliver more power.

-The latter would give rise to the twelve-cylinder ES-550, V-engine designed for 550 to 590 CV. They made other engines under license from Lorraine and Isotta Fraschini.

-The following engines in this range were the ESV and ESVR. Basically the ESV was the ES-550 and the ESVR had a gearbox.

"“ESV"

"ESVR"

-Small engines for light aircraft were also made.

-Like the Praga B and the B-2, D and DR.

-These were some horizontally opposed cylinder engines as we will see. The Praga A was an inverted six-cylinder engine that gave 220 CV.

"Praga B-2"

"Praga D"

-The Praga B and B-2 that were horizontally-opposed two-cylinder engines differed only in the compression ratio. They gave 41 CV.

-The Praga D was a horizontally-opposed four-cylinder engine that delivered 79 CV.

"Praga D"

-The geared DR version could give 90 CV at 3,300 rpm.

"Nice Praga DR design"