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).
Details on the conversion of 13.2mm guns, supply of spare barrels, and a list of pre-production models.
| Identifier | ExFiles\Box 176\1\ img096 | |
| Date | 1st July 1940 | |
| -2- (a) Conversion of two 13.2 m.m. to .5 in.type machine guns. As previously explained the 13.2 m.m. guns are obsolete having no application in M.A.P's present programme. Conversion will entail a new barrel, new feed block casting, new feed slides and pawls and modifications to the existing gun body. The estimated cost of conversion is £100 per gun. (b) Supply of Spare Barrels. The supply of 6 spare barrels is requested, the allocation being, 4 barrels to provide one spare barrel per gun which will be needed during extended trials. 2 barrels to be used for gun trials and ballistic tests during development. The estimated cost of the 6 spare barrels is £40. per barrel. (c) Models produced prior to manufacture of first gun. A list of models prior to the manufacture of the first gun was given in our previous request for contract cover - reference Hs{Lord Ernest Hives - Chair}/Brns.1/WI.1.7.40. We wish to augment this list with the complete wooden models intended for aircraft installation purposes. The complete list of models, therefore, is as follows:- Initial wooden model of complete gun - drg. A.1031. Wooden model of barrel extension - drg. CA.1047. to determine machining operation. Steel model of buffer - drgs. CA.1026-30. Steel model of breech block and anvil for striking velocity. experiments - drgs. CA.1016, 10K2, 33-34 and Ex.36735. Barrel and breech proof housing to prove mechanism under firing pressure - drg. CS. 85. Working model in steel and aluminium of feed l vers - drgs. CA.1001 15 and CA.1017 SR. Two final wooden models of complete gun for aircraft installation. | ||