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).
Engineering memo discussing frame stiffness calculations, ride quality, and a critique of Dubonnet and Chevrolet suspension designs.
| Identifier | ExFiles\Box 125\1\ scan0086 | |
| Date | 9th June 1934 guessed | |
| (4) center of the X, to really make it work. By doing it we have doubled the stiffness (torsional) of the rear half of the frame, and now have approximately :- 4000 lbs ft/degree - front half (to wheel center) 8000 lbs ft/degree - rear half (to wheel center) 2700 lbs ft/degree - between wheel centers, front to rear. I think this is going to be nearly enough to give us good, steady convertibles. As we stiffen the frame we appear to get a smoother ride. Probably because we are rising above our resonances. The situation on the Dubonnet types appears practically hopeless. Here they have to get high frequencies with the two big slugs of metal out at each wheel. It is only the stubborn pride of some of the powers that be who permitted Chevrolet to go down this road, which keeps them slugging at this suspension, getting deeper & deeper in | ||