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).
Design considerations for car bonnets, including materials and fixings.
| Identifier | ExFiles\Box 119\4\ scan0013 | |
| Date | 18th June 1931 | |
| -2- Ev{Ivan Evernden - coachwork}2/18.6.31 contd. Also we fear that as the hinge material of the hinge would not be rustless terrible staining would occur in the case of light coloured cars. ALUMINIUM BONNETS. Our original suggestion of using countersunk rivets in all places except the hinge joints have proved useless and we have to give the matter a fresh consideration. We shall send to you by the weekend a design for a bonnet in aluminium preferably for P.2. having concealed hinges at the sides, the hinges in all cases being attached by snap headed rivets which are not visible. The only way to deal with the stiffeners is to do away with them, and hope to make the bonnet stiff enough by thickening it up to .104". Likewise there will be no wearing strips, but to help in preventing the bonnet being eaten away we are suggesting a rubber bearing material instead of ferodo. The only rivets left will be those attaching the flip-flap shutters, and then only four per shutter. We are inclined to think that we shall prefer this bonnet to the steel one for P.2. andperhaps for the smaller car. Ev.{Ivan Evernden - coachwork} | ||