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Sunbeam Maori


A direct development of the Afridi, the Sunbeam Maori was far more successful. In similar fashion to Coatalens development of Sunbeam's side-valve engines he increased the bore to 100 mm (3.94 in) retaining the stroke of 135 mm (5.31 in), displacing 12.27 l (748.8 cu in) for a power output of 260 hp (194 kW) at 2,000rpm driving a geared propeller.

Production of the Maori began in April 1917, including 100 Afridis which were converted to Maoris on the production line as the Maori Mk.I, with new-build Maoris designated as Maori Mk.II. Converted Afridis, (Maori Mk.I), were rated at 250 hp (186 kW) at 2,000rpm, whilst new-build Maori Mk.IIs were rated at 260 hp (194 kW) at 2,000rpm.

Maoris found favour with Short and Fairey seaplanes as well as Handley Page O/400 bombers, with development continuing to give the Maori Mk.III and Maori Mk.IV. The Maori Mk.III introduced cylinder banks with exhaust ports on the outside rather than the inside of the Vee and the carburettors on the inside. The Mk.III was rated at 275 hp (205 kW).

The final Maori version was designed specifically for use in airships as the Maori Mk.IV, with controls mounted directly on the rear of the engine, flywheel, enlarged cooling system and water-cooled exhaust pipes. Fitted to R33 and R34, five Maori Mk.IVs were fitted to each airship in gondolas, allowing the engines to be tended by on-board mechanics.


Avro 529 Silver King
Curtiss H.12  
Fairey F.2a Patrol
Fairey F.22 Campania
Fairey III
Grahame-White E.IV Ganymede  
Handley Page O/100  
Handley Page O/400
HM Airship R.33
HM Airship R.34
Parnall Zeppelin-Strafer
Royal Aircraft Factory CE.1
Royal Aircraft Factory RE.9
Short N.2B
Short Type 184  
Vickers FB.27 Vimy
Wight Tractor seaplane


Maori II
Type: V-12 Water-cooled 60 degree piston engine
Bore: 100 mm (3.94 in)
Stroke: 135 mm (5.31 in)
Displacement: 12.27 l (748.8 cu in)
Length: 1,612.9 mm (63.50 in)
Width: 850.9 mm (33.50 in)
Height: 873.76 mm (34.40 in)
Dry weight: 490 kg (1,080.27 lb)
Designer: Louis Coatalen
Valvetrain: Twin overhead camshafts, four valves per cylinder
Fuel system: Gravity feed to four Claudel Hobson CZS 38 mm (1.50 in) carburettors
Fuel type: Gasoline
Oil system: Dry sump pressure feed
Cooling system: Water-cooled by radiator
Power output: 260 hp (194 kW)at 2,000rpm
Compression ratio: 5.3:1






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