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( R e d i r e c t e d f r o m A l f a 1 2 6 R . C . 3 5 )
Alfa Romeo built/designed a range of aircraft engines based on the Bristol Jupiter and Bristol Pegasus designs, designated Alfa 125 , Alfa 126 , Alfa 127 , Alfa 128 , Alfa 129 and Alfa 131 . All these essentially similar engines were mainly fitted to Italian bombers in World War II, Alfa Romeo building around 11,000 units between 1934 and 1944
[1]
Design and development [ edit ]
Alfa Romeo adapted the Jupiter / Pegasus (which are very closely related) to metric measurements, local materials and indigenous equipment.
Variants [ edit ]
Alfa Romeo 131, 9-cyl radial engine.
(The Italian engine designation system includes a suffix indicating major components or attributes. The most common were R for Riduttore - reduction gear and C for Compressore - compressor/supercharger, followed by a number indicating the rated altitude in hundreds of metres, two speed superchargers were indicated by a double figure such as 10/34).
Alfa Romeo Jupiter
The standard 313 kW (420 hp ) Jupiter engine built under licence from the Bristol Aeroplane Company .
Alfa 125 R.C.10
rated at 1,000 m (3,300 ft )
Alfa 125 R.C.35
1934 — 485 kW (650 hp ) rated at 3,500 m (11,500 ft )
Alfa 126 R.C.10
1935 — Civilian version of 126 R.C.34 559–597 kW (750–801 hp ) rated at 1,000 m (3,300 ft )
Alfa 126 R.C.32
rated at 3,200 m (10,500 ft )
Alfa 126 R.C.34
1935 — 507–582 kW (680–780 hp ) rated at 3,400 m (11,200 ft )
Alfa 127 R.C.50
rated at 5,000 m (16,000 ft )
Alfa 127 R.C.55
1937 — 560 kW (750 hp ) rated at 5,500 m (18,000 ft )
Alfa 128 R.C.18
641–717 kW (860–962 hp ) rated at 1,800 m (5,900 ft )
Alfa 128 R.C.21
1938 — 708 kW (949 hp ) rated at 2,100 m (6,900 ft )
Alfa 129 R.C.32
rated at 3,200 m (10,500 ft )
Alfa 131 R.C.14/50
1943 — Two speed supercharger, rated at 1,400 m (4,600 ft ) in low gear and 5,000 m (16,000 ft ) in high gear.
Applications [ edit ]
Specifications (Alfa 128 R.C.21) [ edit ]
Data from Aircraft Engines of the World 1945[6]
Archivio Storico Alfa Romeo - Volume II[7]
General characteristics
Type: 9-cylinder air-cooled radial engine
Bore : 146 mm (5.75 in )
Stroke : 190 mm (7.48 in )
Displacement : 28.6 L (1,745.28 cu in )
Length: 1,329 mm (52.3 in )
Diameter: 1,400 mm (55.1 in )
Dry weight : 516 kg (1,138 lb )
Frontal Area: 1.54 m 2 (16.6 sq ft )
Components
Valvetrain : 2 x inlet valves and 2 x exhaust valves per cylinder operated by pushrods and rockers
Supercharger : Gear-driven 1-speed, 8.8:1 ratio, supercharger
Fuel system: 1 x Mona-Hobson AVT85MC updraught carburettor with automatic boost control
Fuel type: 87 octane
Oil system: 551.6 kPa (80 psi), dry sump .
Cooling system: Air-cooled
Reduction gear : Epicyclic bevel reduction gear, 0.65:1 ratio.
Starter: Garelli compressed air starter
Ignition: 2 x Marelli MF9 magnetos, 2 x spark plugs per cylinder, fed by a shielded harness.
Performance
Power output:
Take-off: 708 kW (950 hp ) at 2,300 rpm with 1,000 mm (39.37 in ) Hg boost
Military: 641 kW (860 hp ) at 2,300 rpm at 2,100 m (6,900 ft )
Cruising: 492 kW (660 hp ) at 1,800 rpm at 2,500 m (8,200 ft )
Specific power : 24.57 kW/L (0.54 hp/cu in)
Compression ratio : 7:1
Specific fuel consumption : 0.31 kg/kW/hr (0.51 lb/hp/hr) (take-off)
Oil consumption: 0.0078 kg/kW/hr (0.013 lb/hp/hr)
Power-to-weight ratio : 0.782 kW/kg (0.775 hp/lb)
See also [ edit ]
Comparable engines
Related lists
References [ edit ]
Notes
^ "AlfaAEREI Collezione Modelli di Marco Rigoni Settembre 2005" (PDF) . aerei-italiani.net . Archived from the original (PDF) on 5 June 2007. Retrieved 2007-04-25 .
^ "Macchi M.C.100 - 1939" . Angelfire . Archived from the original on 31 October 2007. Retrieved 2007-09-20 .
^ "The Savoia-Marchetti S.M. 79 Sparviero" . xs4all.nl/~fbonne/warbirds . Archived from the original on 17 July 2007. Retrieved 2007-08-27 .
^ Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 288–289.
^ Archivio Storico Alfa Romeo - Volume II. Torino, November 1998
Bibliography
Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 288–289.
Archivio Storico Alfa Romeo - Volume II. Torino, November 1998
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Alfa_Romeo_125&oldid=1229132794 "
C a t e g o r i e s :
● 1 9 3 0 s a i r c r a f t p i s t o n e n g i n e s
● A i r c r a f t a i r - c o o l e d r a d i a l p i s t o n e n g i n e s
● A l f a R o m e o a i r c r a f t e n g i n e s
● T h i s p a g e w a s l a s t e d i t e d o n 1 5 J u n e 2 0 2 4 , a t 0 2 : 0 5 ( U T C ) .
● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n .
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