# RAF 3

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For the wrestling events, see [RAF 03](/source/RAF_03), [RAF 07](/source/RAF_07).

The **RAF 3** is a British liquid-cooled, [V12](/source/V12_engine) engine developed for [aircraft](/source/Aircraft) use during [World War I](/source/World_War_I). Based on the eight–cylinder [RAF 1](/source/RAF_1) it was designed by the [Royal Aircraft Factory](/source/Royal_Aircraft_Factory) but produced by the two British companies of [Armstrong Whitworth](/source/Armstrong_Whitworth) and [Napier & Son](/source/Napier_%26_Son). The **RAF 7** was a [high compression](/source/Compression_ratio) version of the same engine.[1]

## Variants

**RAF 3**- 1914 - Prototype engine, 200 [horsepower](/source/Horsepower) (150 kW).
**RAF 3a**- 1914 - Main production variant, increased [bore](/source/Bore_(engine)), 260 horsepower (194 kW). 29 built by Armstrong Whitworth, 260 built by Napier & Son.
**RAF 7**- 300 horsepower (224 kW) high compression version with high-lift [camshafts](/source/Camshaft).

## Applications

- [Airco DH.4](/source/Airco_DH.4)
- [Royal Aircraft Factory R.E.7](/source/Royal_Aircraft_Factory_R.E.7)

## References

### Notes

1. Gunston, 1989, p. 156.

### Bibliography

- Gunston, Bill. *World Encyclopaedia of Aero Engines*. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
- Lumsden, Alec. *British Piston Engines and their Aircraft*. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

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Adapted from the Wikipedia article [RAF 3](https://en.wikipedia.org/wiki/RAF_3) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/RAF_3?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.