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).
Summary report on firing tests for a Port Gun and a Starboard Gun, detailing performance, stoppages, and servicing.
| Identifier | ExFiles\Box 176\1\ img220 | |
| Date | 8th May 1942 | |
| -2- Ve/WP.1/CB.8.5.42. The following is a summary of the firings, most of which were carried out in the air with the plane diving to simulate an attack on a ground target. Port Gun, 12051, R.H. Rounds fired - 1,006. Practice ammunition - 766; Armour piercing ammunition - 240. Air firing - 905; Ground firing - 101. Stoppages. Broken sear after 833 rounds. Misfires after 879, 881, 882 rounds due to unfilled ammunition. Accuracy. - Very good. 100% group at 500 yds. - 22 ins. dia. before; 18 ins. dia. after. Replacements due to breakage. - 1 Firing sear. Servicing. - Nil except for cleaning breech block and topping up air pressure every three days. Starboard Gun, 12054, L.H. Rounds fired - 1,008 Practice ammunition - 765; Armour piercing ammunition - 243. Air firing - 908; Ground firing - 100. Stoppages. Striker spring retaining claw slipping - after 77, 434, 437, 495 rounds. Misfires due faulty ammunition - " 861, 871 " Premature fires - " 57, 376 " Hand extraction due to faulty ammunition - " 357, 843 " Misfeeds - " 499, 918, 920, 923, 944, 956, 963, 980." Broken extractor - " 310, 664, 706, 800 " Broken sear - " 544, 553 " Broken front slide - " 818 " cont'd.{John DeLooze - Company Secretary} | ||