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 failure of rubber blocks which are not lasting more than 250 miles due to design flaws.
| Identifier | ExFiles\Box 95\4\ scan0083 | |
| Date | 23th February 1937 | |
| 1113 342 HOTEL DE FRANCE. CHATEAUROUX. Indre. France. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/3/JAB. 23rd February 1937. To. Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} The rubber blocks as at present designed will not stand up to the job for more than 250 miles. The chief trouble is in the spherical ball not being located in the tube and not giving sufficent area of contact in the working position. Another feature is the damper arm ball end is not in line with the anchorage ball end. This makes the faces of the rubber blocks work at an angle which forces the connecting tube over, at the same time cutting into the rubber block. The enclosed sketch shows more clearly what is happening and what in our opinion is required. ------------ Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||