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 arrangement and specifications of blast tubes for a 40mm gun fitted to a Beaufighter aircraft.
| Identifier | ExFiles\Box 176\1\ img176 | |
| Date | 9th May 1941 | |
| To Rm.{William Robotham - Chief Engineer} from Ev{Ivan Evernden - coachwork}/JD.{J. Draper - Frames} c. [blacked out] c. [blacked out] c. [blacked out] Ev{Ivan Evernden - coachwork}/JD.{J. Draper - Frames}2/SW.9.5.41. 40 m/m Gun in Beaufighter. We attach to Rm{William Robotham - Chief Engineer}/HH's copy the original of :- QPL.185 Arrgt. of Blast Tubes (40 m/m Gun in Beaufighter) The above scheme shows the blast tube extension between the front bulkhead and the gun front spherical mounting, spring loaded to assist in assembling and removing the gun when in the plane. The actual blast tube which is 4.000 inside diameter, should be 48.000 long, and will be cut to suit the aeroplane fuselage when assembling. Ev{Ivan Evernden - coachwork}/JD.{J. Draper - Frames} Original to Rm{William Robotham - Chief Engineer}/HH. Prints to Ev.{Ivan Evernden - coachwork} Vs.{J. Vickers} Rm{William Robotham - Chief Engineer}/HH. & Ashby. | ||