Pobjoy Niagara

From Wikipedia, the free encyclopedia

The Pobjoy Niagara was a British 7-cylinder, air-cooled, radial, aero-engine first produced in 1934, with an unusual offset-from-center propshaft due to its engine reduction gearing. The Niagara was a popular engine for light and experimental aircraft. The entire series of Pobjoy motors were 7-cylinder radials with incredibly compact dimensions and very high rpm. The entire Pobjoy range were well regarded due to their small diameter, smooth operation, low noise and innovative engineering.

[edit] Specifications (Pobjoy Niagara IV)

General characteristics

• Type: 7-cylinder, air-cooled, radial engine
• Bore: 3.19 inches (81 mm)
• Stroke: 3.49 in (88 mm)
• Displacement: 3.1 Litres (191 cu in)
• Length: 22 in (559 mm)
• Diameter: 27.5 in (698 mm)
• Dry weight: 164lb (74kg)

Components

• Valvetrain: 1 inlet and 1 exhaust valve per cylinder
• Fuel system: 1 Claudel carburettor
• Fuel type: 70 octane
• Cooling system: air

Performance

• Power output: 100 hp at 3,230 rpm max
  108 hp at 3,750 rpm cruise
• Compression ratio: 6.50:1
• Power-to-weight ratio: 1.64 lb/hp (cruise)

[edit] Applications

• Airspeed Fleet Shadower
• General Aircraft Monospar ST-25
• Saro Shrimp
• Short Scion Senior
• Short Scion
• Short_Stirling (half scale prototype)
• Spartan Clipper

[edit] References

• Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens, 126. 
• http://www.oldengine.org/members/diesel/Duxford/ukaero3.htm

v • d • e Lists relating to aviation General Timeline of aviation · Aircraft (manufacturers) · Aircraft engines (manufacturers) · Airports · Airlines Military Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft Accidents/incidents General · Military · Commercial (airliners) · Deaths Records Airspeed · Distance · Altitude · Endurance · Most-produced aircraft