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).
Potential modifications to the Phantom four-wheel brake system to adjust friction and prevent thumping.
| Identifier | WestWitteringFiles\N\October1925-December1925\ Scan46 | |
| Date | 22th October 1925 | |
| R.R. 235A (100 T) (S.H. 159 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 TO HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} DA{Bernard Day - Chassis Design}3/M22.10.25. PHANTOM FOUR WHEEL BRAKES. X8420 Referring to HS{Lord Ernest Hives - Chair}9/LG141025., we do not remember to have seen previously a report that you could not get sufficient friction out of the device shewn on N.sch. 1860., to prevent thumping. Unfortunately we do not seem to have a print of this drawing here, but from what we remember we think it is possible to increase the friction considerably without altering the scheme, by modifiying the Thackeray washer. If this were possible it would no doubt be an advantage for use with existing cars. We have asked Derby for a print and will send you particulars as soon as we get it. In order to reduce the amount of friction required on the suspension link it was proposed to fit an additional pull off spring on the front brake system, this spring taking the form of a helical twisting spring on the counter-shaft, mounted on one of the tie-rod king posts. Do you say that this additional spring makes no difference to the amount of friction required? DA.{Bernard Day - Chassis Design} | ||