How a tiny brass washer helped Spitfires outmanoeuvre the Luftwaffe
In short: During the Battle of Britain, RAF pilots faced a deadly disadvantage: when diving to pursue enemies, their engines would stall. This vulnerability allowed German fighters to escape. A brilliant engineer solved the crisis with a simple, elegant device that transformed the performance of the iconic Rolls-Royce Merlin engine.
In the early stages of World War II, the Rolls-Royce Merlin engines powering the Hurricane and Spitfire faced a critical flaw. When pilots performed nose-down maneuvers to dive, the resulting negative g-force would flood the SU carburettor, causing the engine to stall. This was a catastrophic disadvantage during dogfights, as German fighters utilized fuel injection technology, allowing them to evade pursuing RAF aircraft through negative g-manoeuvres.
Beatrice Shilling, an engineer at the Royal Aircraft Establishment (RAE), devised a timely solution: the RAE Restrictor. Originally a brass thimble with a central hole, the device was eventually simplified into a flat washer of extremely precise dimensions. This component could be welded into the engine's fuel line without requiring the aircraft to be taken out of service. Using her old racing motorbike, Shilling guided a crew to install the component at RAF fighter bases by March 1941.
The device was so effective it was nicknamed 'Miss Shilling's orifice' by Rolls-Royce engineer Sir Stanley Hooker. Her influence reached well past this temporary fix, which remained in use until 1943 when pressure carburettors arrived. Despite her technical brilliance, she faced significant systemic barriers; she was never offered top posts at the RAE because such promotions were reserved for men, and she encountered various forms of gender discrimination throughout her career.
Beyond her wartime contributions, Shilling was a formidable competitor. She was one of only three women to receive the British Motorcycle Racing Club Gold Star for lapping the Brooklands circuit at over 100 mph, achieving an average speed of 101.85 mph on her Norton M30 on 24 August 1934. Her legacy lives on through various memorials, including buildings at Royal Holloway University and Coventry University.
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Sources
- Summary by Intellect · source: Beatrice Shilling
- Also: Beatrice Shilling – Engineer and Battle of Britain heroine
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