With the Shackleton (Griffon)and Wyvern (Eagle) and Lincoln (Merlin) Rolls Royce went for annular radiators.
One ex-Lancaster gunner told me that his crew preferred the 4x.303 to the 2x 0.5 as they loaded the guns with all tracer on the principle that the purpose of firing the guns was to frighten the night fighter away, not to necessarily shoot them down and make them look for an easier target.
One ex-Lancaster gunner told me that his crew preferred the 4x.303 to the 2x 0.5 as they loaded the guns with all tracer on the principle that the purpose of firing the guns was to frighten the night fighter away, not to necessarily shoot them down and make them look for an easier target.