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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specifications for a 13.2mm aircraft gun intended to follow the 40mm gun, including production considerations.

Identifier  ExFiles\Box 176\1\  img011
Date  30th January 1940
  
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Rm.{William Robotham - Chief Engineer}9/MH.{M. Huckerby}30.1.40.

on guns the range would find its keep, but that should the armament work fall off it would be a dead loss to Rolls-Royce Ltd. and they would expect to be compensated for it.

Inspection of Work in Progress.

A visit was paid to Sinfin to inspect the pieces in process of manufacture, and also the experimental rigs in use.

GUN TO FOLLOW ON 40 mm. GUN.

The following specification for the gun to follow on the 40 mm. was agreed on:-

(1) Calibre - 13.2 mm.
(2) Speed of fire - 900-1000 rounds per minute.
(3) Length of burst - 100 rounds.
(4) Weight - 60 lbs. plus or minus 5.
(5) Recoil load - 400 lbs.
(6) The gun should, as far as possible, be able to be installed in the Spitfire or Hurricane aircraft as they were likely to be produced in 2 years' time.
(7) The gun should be able to operate at low temperatures without freezing up.
(8) It should use existing 13.2 ammunition with disintegrating belt.
(9) The ammunition muzzle velocity, chamber pressures etc. would be forwarded.

Production.

Air Commodore Andrews raised the question of whether Rolls-Royce could agree to start for the production of this gun in small quantities whilst jigs and tools were being prepared for large production. He suggested 200 or 300 a month. Hs.{Lord Ernest Hives - Chair} said that provided somebody could undertake barrel production this would not seem to be impossible.
  
  


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