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).
Two schemes for curing 'brake jaggers' on a Bentley, recommending one but requesting further tests.
| Identifier | ExFiles\Box 85\1\ scan0185 | |
| Date | 24th August 1936 | |
| SECRET. x Wb{Mr Brazier/Mr Bell} Martindale To Sg.{Arthur F. Sidgreaves - MD} and Wor.{Arthur Wormald - General Works Manager} E.1/HP.24.8.36. c.c. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} Hd.{Mr Hayward/Mr Huddy} Mx.{John H Maddocks - Chief Proving Officer} Da.{Bernard Day - Chassis Design} Brake Jaggers on Bentley. Of the two main schemes for curing brake jaggers, namely N.Sch.4860 double lever operation of the same type as fitted to 6-B-IV, and N.Sch.4865 with the bob weight balancer, the latter has proved more effective. N.Sch.4860 at the same time cures thumps and is a more efficient scheme as it does not interpose any more mechanism between the brake shoe and the brake pedal. We, therefore, concur with Hs.{Lord Ernest Hives - Chair}7/KW.21.8.36 in pressing on with some pieces for production of the balance weight scheme, but at the same time we want some further tests making to satisfy ourselves that the bob weight has not got some vices in addition to its virtues. I refer mainly to the possibility of the weight opening and shutting the adjustment, momentarily pulling on the brake when bounced vertically, as might occur on a rough piece of road. We have arranged with Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} to carry out further tests desired. E.{Mr Elliott - Chief Engineer} | ||