Pobjoy Niagara

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,Gunston 1989, p.111. well regarded due to its small diameter, smooth operation, low noise and innovative engineering.

Variants Niagara I Bore/stroke 77 × 87 mm (3.03 × 3.43 in), swept volume . Compression 6.25:1, gearing 0.47:1. Normal continuous power at 3,200 rpm at sea level.

Niagara II Bore/stroke 77 × 87 mm (3.03 × 3.43 in), swept volume . Compression 6.0:1, gearing 0.39:1. Normal continuous power at 3,200 rpm at sea level.

Niagara III Bore/stroke 77 × 87 mm (3.03 × 3.43 in), swept volume . Gearing 0.47:1. Normal continuous power at 3,300 rpm at sea level.

Niagara IV Similar to Niagara III but with a higher operating rpm. Normal continuous power at 3,500 rpm at sea level.

Niagara V Larger version of the basic Niagara. Bore/stroke 81 × 87 mm (3.19 × 3.43 in), swept volume . Compression 8.0:1, gearing 0.47:1. Normal continuous power at 4,000 rpm at sea level.

Cataract I-III 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.Jane's All the World's Aircraft p.26dOrd-Hume p.589

Cascade Direct drive version of Cataract I. Normal continuous power at 2,100 rpm.

Applications

Niagara Aeroput MMS-3 Airspeed Fleet Shadower CLW Curlew Comper Kite Comper Swift General Aircraft Monospar ST-25 General Aircraft Fleet Shadower Gribovsky G-25 Lambach HL.I Moss M.A.1 Pobjoy Pirate Saro Shrimp Shapley Kittiwake Short Scion Senior Short Scion Short S.31 (half-scale Stirling) Spartan Clipper Westland CL.20

Cataract British Klemm Swallow Hafner A.R.III Gyroplane Hendy Hobo Pitcairn PA-22

Cascade Autogiro AC-35

Surviving engines A 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.shuttleworth.org Retrieved: 28 February 2017.

Engines on display A preserved Pobjoy Niagara engine is on public display at the Science Museum, London and one is also held at the Museum of Transport and Technology (New Zealand).

Specifications (Pobjoy Niagara IV)

Pobjoy Niagara

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