Rolls-Royce Griffon - Variants

Variants

The Griffon was produced in approximately 50 different variants, the Griffon 130 being the last in the series. Details of representative variants are listed below:

• Griffon IIB

1,730 hp (1,290 kW) at 750 ft (230 m) and 1,490 hp (1,110 kW) at 14,000 ft (4,270 m); Single-stage two-speed supercharger; impeller diameter 10 in (25.4 cm); gear ratios 7.85:1, 10.68:1. Used on Firefly Mk.I and Spitfire XII.

• Griffon VI

Increased maximum boost pressure, 1,850 hp (1,380 kW) at 2,000 ft (610 m); impeller diameter 9.75 in (24.7 cm). Used on Seafire Mk.XV and Mk. XVII, Spitfire XII.

• Griffon 57 and 57A

1,960 hp (1,460 kW); 2,345 hp (1,749 kW) with water-methanol injection on take-off: used on Avro Shackleton.

• Griffon 61

Introduced a two-speed two-stage supercharger with aftercooler similar to that on Merlin 61; 2,035 hp (1,520 kW) at 7,000 ft (2,100 m) and 1,820 hp (1,360 kW) at 21,000 ft (6,400 m); used on Spitfire F.Mk.XIV, Mk.21.

• Griffon 65

Similar to Griffon 61 with different propeller reduction gear; Impeller diameters 1st stage: 13.4 in (34 cm), 2nd stage: 11.3 in (29 cm); used on Spitfire F.Mk.XIV.

• Griffon 72

Increased maximum boost pressure to take advantage of 150-grade fuel; 2,245 hp (1,675 kW) at 9,250 ft (2,820 m).

• Griffon 74

Fuel-injected version of Griffon 72; used on Firefly Mk.IV.

• Griffon 83

Modified to drive contra-rotating propellers; 2,340 hp (1,745 kW) at 750 ft (230 m) and 2,100 hp (1,565 kW) at 12,250 ft (3,740 m).

• Griffon 85

2,375 hp (1,770 kW); used on Spiteful Mk.XIV.

• Griffon 89

2,350 hp (1,755 kW); used on Spiteful Mk.XV.

• Griffon 101

2,420 hp (1,805 kW); Two-stage, three-speed supercharger using Low Supercharger (L.S), Moderate Supercharger (M.S), or Full Supercharger (F.S); reduction gear ratio 4.45; Rolls-Royce fuel injection system. Used on Spiteful Mk.XVI.

• Griffon 130

2,420 hp (1,805 kW) at 5,000 ft (1,524 m) in L.S gear, 2,250 hp (1,678 kW) at 14,500 ft (4,419 m) M.S and 2,050 hp (1,529 kW) at 21,000 ft (6,400 m) F.S; reduction gear ratio 4.44; modified to drive contra-rotating propellers; Rolls-Royce fuel injection system.