Walter Sagitta

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Type	Piston aero engine
National origin	Czechoslovakia
Manufacturer	Walter Aircraft Engines
First run	1937

The Walter Sagitta was a Czechoslovakian, air-cooled, inverted V-12 engine that first ran in 1937. With a displacement of 18.4 litres (1,123 cu in), it produced up to 373 kW (550 hp) at 2,500 rpm.^[1]

Variants

Sagitta I-MR: 550 hp (410 kW) at 2,500rpm at 2,500 m (8,202 ft) - rated height^[2]
Sagitta I-SR: 535 hp (399 kW) at 2,500rpm at 3,800 m (12,467 ft) - rated height^[2]
Sagitta II R.C.: Fully supercharged, 388 kW (520 hp).^[3]

Applications

Fokker D.XXIII
Rogožarski R-313
Savoia-Marchetti SM.86
VEF I-16

Specifications (Sagitta I-SR & I-MR)

Data from ^[2]

General characteristics

Type: 12-cylinder inverted vee piston engine
Bore: 118 mm (4.65 in)
Stroke: 140 mm (5.51 in)
Displacement: 18.4 l (1,122.84 cu in)
Length: 19,140 mm (753.54 in)
Width: 725 mm (28.54 in)
Height: 796 mm (31.34 in)
Dry weight: 372 kg (820 lb) - Direct drive, 385 kg (849 lb) - Geared 2:3

Components

Valvetrain: enclosed push-rod operated rockers, two valves per cylinder closed by triple springs
Supercharger: 8.7 times crankshaft speed - I-MR. 10.2 times crankshaft speed - I-SR
Fuel system: Automatic boost and mixture control by a horizontal carburrettor
Fuel type: 85 Octane Aviation Gasoline
Oil system: Dry sump, one pressure pump and two scavenge pumps
Cooling system: Air-cooled

Performance

Power output:
Take-off: 460 hp (343 kW) at 2,500rpm - I-SR, 560 hp (418 kW) at 2,500rpm - I-MR.
Rated power: 535 hp (399 kW) at 2,500rpm at 3,800 m (12,467 ft) - I-SR, 550 hp (410 kW) at 2,500rpm at 2,300 m (7,546 ft) - I-MR
Maximum Power: 540 hp (403 kW) at 2,600rpm at 4,000 m (13,123 ft) - I-SR, 600 hp (447 kW) at 2,500rpm at 1,750 m (5,741 ft) - I-MR.
Specific power: 24.29 kW/l (0.534 hp/in³)
Compression ratio: 6.25:1
Specific fuel consumption: 0.315 - 0.328 kg/kW/hr (0.525 - 0.548 lb/hp/hr)
Oil consumption: 0.004 - 0.0067 kg/kW hr (0.0067 - 0.11 lb/hp hour)
Power-to-weight ratio: 1.046 kW/kg (0.636 hp/lb)

References

Wikimedia Commons has media related to Walter Sagitta.

Notes

↑ Gunston 1989, p. 174.
↑ 2.0 2.1 2.2 Jane's All the World's Aircraft 1938. London: Sampson, Low & Martin company Limited. 1938.
↑ Flight - 14 October 1937, p. 381. Retrieved: 8 November 2012

Bibliography

Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

v t e Walter aircraft engines

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