Bramo 323

Bramo 323

Bramo 323

The Bramo 323 “Fafnir” is a nine-cylinder air-cooled radial engine, the Brandenburg Motor Works (from 1939: BMW Flugmotorenwerke Brandenburg). The aircraft engine based on the Siemens & Halske or SAM / Bramo built under license Bristol Jupiter. This developed towards the end of the First World War design was already obsolete in the early 1930s. The Bramo 323 was therefore not particularly modern and subject to technological limitations. By 1944, approximately 5.500 “Fafnir” produced.


The development began with the construction of the Bristol Jupiter in a “German” version, and the Sh.20 Sh.21 in 1929. Bore enlarged with 1930 was the Sh.22 with 950 hp (708 kW). Analogous to Jupiter Sh.22 with the control valve located at the front of the bumper looked quite dated. Mid-1930s, the aircraft engine names were changed, with Bramo was assigned to the 300 block. Thus, the Sh.14 was henceforth renamed Bramo 314 and Sh.22 in Bramo 322. The Bramo 322 was never ready for production.

The development is now focused on the basic design and looked for the Bramo a Junkers 323 – gasoline direct injection with front loader. The engine had a displacement of just under 27 liters, producing 900 hp at 2,500 rpm starting power, which rose slightly to 1,000 hp at 3,100 m. The loss of power at sea level is basically limited by the mechanically driven supercharger, which builds a constant boost pressure only above the critical altitude.

The original Bramo 323 was prepared in an A and B variant, which differed in the direction of rotation. The engines were designed for installation in pairs to be made twin-engine aircraft, bringing the torque of the propeller balances. The situation is similar with the C and D variants in which the translation loaders for better performance was reduced at low altitude. Thus, the starting power increased to 1,000 hp, but the critical altitude was reduced.

The final versions of P, R and T were equipped with a switchable between two stages mechanical supercharger for higher performance at all altitudes. This ensured 1,000 hp at sea level as in the C / D variant, but with an improved high-performance 940 hp at 4,570 m altitude. In the R-2 variant was a 50-MW water-methanol injection for improved performance in low altitudes, which brought 1,200 hp at 2,600 rpm, is provided.


With the Bramo 323 Fafnir some German pre-war models were driven to such As the Focke-Wulf Fw 200, Henschel Hs 126, Arado Ar 232, Dornier Do 24 and Dornier Do 17 and the helicopter Focke-Achgelis Fa 223 “Drache”. The first copies of the flying boat Blohm & Voss BV 222 “Viking” were equipped with the Bramo 323 R-2.

Due to the rather high fuel consumption, there was no widespread use of the engine, since most aircraft sit on the similar BMW 132, which had a lower specific fuel consumption depending on version 0.30 and 0.35 kg / kWh as early versions of Fafnir with 0.37 kg / kWh. When the charged variants C and D, the value decreased to 0.31 kg / kWh, but this engine was not high altitude due to the only stage loader suitable.

BMW bought in 1939, the Brandenburg Motor Works. For the few aircraft – especially the Fw 200 and Do 24 – which the Bramo-Fafnir still used after 1940, introduced the group, renamed BMW Flugmotorenwerke Brandenburg company the engine as a replacement unit in the remaining Thu, 17 nor to 1944 here.

As the first land-based passenger aircraft flew on 10 August 1938 a Focke-Wulf Fw 200 Condor, Lufthansa Bramo 323 with four non-stop 6371 km long stretch of the Berlin-Staaken to Floyd Bennett Field in New York City in under 25 hours, this corresponded to an average speed of 254.8 km / h and represented a peak in civilian flight operations dar. The machine could accommodate 25 passengers and fly 3000 km wide. With a wing area of 118 square meters, the Condor was far almost as large as an Airbus 320th Later, the Fw 200 was converted for military purposes.

Technical specifications

Bramo 323 A

•Type: air-cooled nine-cylinder radial engine with direct fuel injection

•Power: 900 hp (662 kW) at sea level, 1,000 hp (736 kW) at 3,100 m

•Output per liter: 27.8 kW / l

•Capacity: 26.82 l

•Diameter: 1,388 mm

•Length: 1,420 mm

•Bore: 154 mm

•Stroke: 160 mm

•Weight: 550 kg

•Valve train: OHV valve timing with cam drum

•Loader: mechanically driven via gear

•Compression ratio: 6.4:1

•Specific consumption: 0.348 kg / kWh

•Power to weight ratio: 1.36 kW / kg

Aircraft with the Bramo 323

Arado Ar 196

•Arado Ar 232

Dornier Do 17

Dornier Do 24

•Focke Fa 223 Achgelis

Focke-Wulf Fw 200

•Henschel Hs 126

Junkers Ju 252

•Junkers Ju 352

Propeller engine

Radial engine (aviation)

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