Pobjoy Niagara

The Pobjoy Niagara was a British air-cooled 7- cylinder radial engine. The engine was produced from 1934 by the company Pobjoy Airmotors and was distinguished by its unusual for a radial engine design. Due to the built- in reduction gear, the motor housing, the motor shaft joined eccentrically out of the engine. The Niagara was a frequently used in light and experimental aircraft engine. The total number of engines produced by Pobjoy engine consisted of 7 -cylinder radial engines with very compact dimensions and very high speeds. Pobjoy Airmotors enjoyed a high reputation for their engines due to their small size, low operating costs, low noise level as well as for their original technical solutions.

Technical data ( Pobjoy Niagara IV)

  • Engine Type: 7- cylinder radial engine, air-cooled
  • Bore: 80.96 mm ( 3.1875 in )
  • Piston stroke: 87.31 mm ( 3.4375 in )
  • Engine Size: 3.15 liters ( 192.0 cubic inches )
  • Length: 558.8 mm ( 22 in )
  • Diameter: 698.5 mm ( 27.5 in )
  • Weight: 74.4 kg (164 lb)
  • Valve arrangement: one intake and one exhaust valve per cylinder
  • Mixture formation: a Claudel carburettor
  • Fuel: gasoline, 70 octane
  • Cooling System: Air Cooling
  • Power max. 79 kW (108 hp) at an engine speed of 3750/min ( Niagara V: 96 kW (130 hp) at 4000 rpm )
  • Performance norm: 74 kW (100 hp) at 3250/min
  • Compression ratio: 6.5:1
  • Power Weight: 1 kg / kW (1.64 lb / hp) ( pu )

Use

  • Airspeed Fleet Shadower
  • General Aircraft mono -saving ST -25
  • Saro Shrimp
  • Short Scion Senior
  • Short Scion
  • Short Stirling ( scaled test pattern )
  • Spartan Clipper
  • Pobjoy Pirate

Swell

  • Bill Gunston: World Encyclopedia of Aero Engines. S. 126, Wellingborough: Patrick Stephens 1986
  • Http://www.oldengine.org/members/diesel/Duxford/ukaero3.htm
  • Radial engine (aviation )
  • Propeller engine
Power-to-weight ratio
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