Aircraft engine: RAF 3a Napier
Great Britain
inline engine
1914
| Configuration | 12-cylinder V 60° |
| Cooling | liquid-cooled |
| Displacement | 17.2 l (1,049.4 cu in) |
| Compression ratio | 5.3 |
| Weight | 390 kg (860 lb) |
| Maximum power | 260 hp at 1,750 RPM |
The engine was designed at the Royal Aircraft Factory based on the 8-cylinder RAF 1. A notable feature was that both intake and exhaust valves controlled by a single pushrod. Production of the new model was undertaken by Armstrong Whitworth and D. Napier & Son Ltd. The RAF 3a was the main production variant with increased bore compared to the original RAF 3 design.
260 examples overall were built by Napier & Son in addition to 29 manufactured by Armstrong Whitworth. The engine was fitted to the Airco DH.4 light bomber.
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Dofinansowano ze środków Ministra Kultury i Dziedzictwa Narodowego 
