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).
Proposed rivetless aluminium bonnet design to replace a steel one.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan273 | |
| Date | 23th June 1931 | |
| AJL ORIGINAL. BY.{R.W. Bailey - Chief Engineer} FROM DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} Copy to G.{Mr Griffiths - Chief Accountant / Mr Gnapp} HS.{Lord Ernest Hives - Chair} re. BONNETS. DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}2/M23.6.31. X7-60 X5-60 X385. We have already outlined to you a means of building up a steel bonnet for the 20/25. using electric/welding. We are now sending you N. scheme 3294. shewing a bonnet in aluminium which is rivetless. We have drawn it for N. 2. series P. 2. The idea is to so treat the hinges as to conceal the rivets, and to abolish all stiffeners to the side panel by increasing the plate thickness to .104 or even .116 or .125". Flip flap shutters are fitted using 8 rivets each, and we suggest that these might be tried as countersinks now the material thickness is so much greater. As an alternative to the ferodo bearing strip we suggest trying rubber, as it should prove quieter and less likely to wear into the aluminium panel. We would like a bonnet to this design fitted to a car and tested for stiffness and wear, as well as appearance. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} [Stamp: RECEIVED 1931 JUN 26] | ||