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).
The increased size and weight balance of the Enlarged Face Shield Type BD Gun.
| Identifier | ExFiles\Box 175\3\ img306 | |
| Date | 5th February 1941 | |
| c. to Rm.{William Robotham - Chief Engineer} Ev.{Ivan Evernden - coachwork}1/JH.5.2.41. 3 re Enlarged Face Shield Type BD.{Mr Berend} Gun. With reference to the reply from Lt. R.F. Young concerning the increase in size of the face shield for the above gun and of which reply we have received a copy, we do not understand why a figure of 1/2 sq.ft. increase in area is mentioned if the out of balance after filling the armrest with lead is equivalent to 16 lbs. weight at the armrest, but as already stated(Ev.{Ivan Evernden - coachwork}3/JH.31.1.41) we estimate this out of balance to represent 23.8 lbs. weight at the face shield or approximately an increase in area of 170 sq.in. i.e. 1.18 sq/ft. Ev.{Ivan Evernden - coachwork} | ||