Pobjoy Niagara

Pobjoy Niagara

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.

pecifications (Pobjoy Niagara IV)


type=7-cylinder, air-cooled, radial engine
bore=3.1875 inches (80.96 mm)
stroke=3.4375 in (87.31 mm)
displacement=192.0 cuin (3.15 L)
length=22 in (558.8 mm)
diameter=27.5 in (698.5 mm)
weight=164 lb (74.4 kg)
valvetrain=1 inlet and 1 exhaust valve per cylinder
fuelsystem=1 Claudel carburettor
fueltype=70 octane
power=108 hp at 3,750 rpm max (130@4000 Niagara V)
100 hp @ 3,250 rpm max cruise
power/weight=1.64 lb/hp (cruise)


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


* http://www.oldengine.org/members/diesel/Duxford/ukaero3.htm

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