Bramo 323

The Bramo 323 " Fafnir " is an air-cooled nine-cylinder radial engine of the Brandenburg Motor Works (from 1939: BMW Flugmotorenwerke Brandenburg). The aircraft engine was based on the Siemens & Halske or SAM / Bramo built under license Bristol Jupiter This towards the end of the First. world War developed design was already obsolete in the early 1930s. Bramo the 323 was therefore not particularly modern and subjected to technological limits. By 1944, approximately 5,500 " Fafnir " were produced.

Development

Development began with the construction of the Bristol Jupiter in a "German" version, the Sh.20 and Sh.21 in 1929. With enlargement of the hole in 1930 was the Sh.22 with 950 hp ( 708 kW). Analog saw Jupiter the Sh.22 with the forward rails bumpers of the valve control rather old-fashioned center. 1930s the flight engine designations have been changed, with Bramo got assigned to the 300 block. way of Sh.14 was henceforth in Bramo 314 and the Sh.22 in Bramo 322 renamed. Bramo The 322 was never ready for production.

The development is now focused on the basic design and looked for the Bramo 323 before a Junkers petrol direct injection with a turbocharger. The engine had a displacement of just under 27 liters and produced 900 horsepower off power to 2,500 rpm, which increased slightly to 1,000 hp 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 in twin-engine aircraft, bringing the torque of the propeller balances. Analog is the case with the C and D variants in which the loader translation 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 an improved level performance with 940 hp at 4,570 m altitude. In the R- 2 variant was a MW -50 water-methanol injection for improved performance in low altitudes, which brought 1,200 hp at 2600 rpm, is provided.

Applications

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 at 0.37 kg / kWh. In 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 single-stage supercharger 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, presented the company was renamed in BMW Flugmotorenwerke Brandenburg companies the engine, also known as exchange unit in the remaining Thu, 17 nor to 1944 ago.

The first land-based passenger aircraft flew on 10 August 1938, Focke-Wulf Fw 200 Condor Lufthansa with four Bramo 323 nonstop the 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, setting a peak in the civilian flight operations represents the machine could accommodate 25 passengers and fly 3000 km wide. With a wing area of 118 square meters, the Condor was so far almost as large as an Airbus 320 Later, the Fw 200 was converted for military purposes.

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
  • Pump capacity: 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 control with cam drum
  • Loader: mechanically driven via gear
  • Compression: 6,4:1
  • Specific consumption: 0.348 kg / kWh
  • Power to weight ratio: 1.36 kW / kg

Aircraft with the Bramo 323

MW-50 Brake specific fuel consumption Legal name (business) Engine displacement
134100
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