| 词条 | Pobjoy Niagara | |||||||
| 释义 |
The Pobjoy Niagara is a British seven-cylinder, air-cooled, radial, aero-engine first produced in 1934. The design ran at higher speeds than conventional engines, and used reduction gearing to lower the speed of the propeller. This led to a noticeable off-centre mounting for the propeller. The Niagara was a popular engine for light and experimental aircraft,[1] well regarded due to its small diameter, smooth operation, low noise and innovative engineering. Variants
Bore/stroke 77 x 87 mm (3.03 x 3.43 in), swept volume 2,835 cc (173 cu in). Compression 6.25:1, gearing 0.47:1. Normal continuous power 84 hp (63 kW) at 3,200 rpm at sea level.[2]
Bore/stroke 77 x 87 mm (3.03x3.43 in), swept volume 2,835 cc (173 cu in). Compression 6.0:1, gearing 0.39:1. Normal continuous power 84 hp (63 kW) at 3,200 rpm at sea level.[2]
Bore/stroke 77 x 87 mm (3.03x3.43 in), swept volume 2,835 cc (173 cu in). Gearing 0.47:1. Normal continuous power 88 hp (66 kW) at 3,300 rpm at sea level.[2]
Similar to Niagara III but with a higher operating rpm. Normal continuous power 98 hp (73 kW) at 3,500 rpm at sea level.[2]
Larger version of the basic Niagara. Bore/stroke 81 x 87 mm (3.19 x 3.43 in), swept volume 3,138 cc (191.5 cu in). Compression 8.0:1, gearing 0.47:1. Normal continuous power 125 hp (93 kW) at 4,000 rpm at sea level.[2][7]
De-rated, uncowled versions of Niagara I-III with simple inter-cylinder baffles for cooling and trickle-down lubrication for lower exhaust rockers. Compression 5.7:1, gearing 0.47:1.[2][2][3]
Direct drive version of Cataract I. Normal continuous power 66 hp (49 kW) at 2,100 rpm.[3] ApplicationsNiagara
Cataract
Cascade
SurvivorsA Pobjoy Niagara powered Comper Swift G-ACTF that is owned and operated by The Shuttleworth Collection, Old Warden remains airworthy in 2017 and displays to the public at home airshows during the flying season.[4] Engines on displayA preserved Pobjoy Niagara engine is on public display at the Science Museum (London). Specifications (Pobjoy Niagara IV){{pistonspecs| |ref=Lumsden.[5] |type=7-cylinder, air-cooled, radial engine |bore=3.03 in (77 mm) |stroke=3.43 in (87 mm) |displacement=173 cu in (2.8 L) |length= |diameter=26.5 in (673 mm) |width= |height= |weight=130 lb (59 kg) |valvetrain=1 inlet and 1 exhaust valve per cylinder |supercharger= |turbocharger= |fuelsystem=1 Claudel-Hobson carburettor |fueltype=70 octane |oilsystem= |coolingsystem=Air-cooled |power=98 hp at 3,625 rpm max at sea level |specpower= |compression=6:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=0.75 hp/lb }} See also{{aircontent|see also= |related=
|similar aircraft= |lists=
|similar engines=
}} ReferencesNotes1. ^Gunston 1989, p.111. 2. ^1 Jane's All the World's Aircraft p.26d 3. ^1 Ord-Hume p.589 4. ^www.shuttleworth.org Retrieved: 28 February 2017. 5. ^1 2 3 4 5 6 Lumsden 2003, p.179. Bibliography{{refbegin}}
External links{{Commons category}}
2 : Radial engines|Aircraft piston engines 1930–1939 |
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