Performance
Gun effective ceiling varied depending on the predictor and fuze. The Mk VI ordnance significantly increased the potential effective ceiling. The British definition of effective ceiling at the start of World War II was “that height at which a directly approaching target at 400 mph can be engaged for 20 seconds before the gun reaches 70° elevation”
- Mk III Ordnance, Predictor No 1 and Fuze No 199 – 23,500 feet
- Mk III Ordnance, Predictor No 1 and Fuze No 208 – 24,600 feet
- Mk III Ordnance, Predictor No 2 and Fuze No 208 – 25,300 feet
- Mk III Ordnance, Predictor No 11 and Fuze No 208 – 32,000 feet
- Mk VI Ordnance, Predictor No 11 and Fuze No 208 – 45,000 feet
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