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).
Comparing two design schemes, PL.167 and PL.229, for a revised Buick type pivot.
| Identifier | ExFiles\Box 121\1\ scan0282 | |
| Date | 24th May 1940 | |
| SECRET. 1029. To Rm.{William Robotham - Chief Engineer} c.c. to Rm{William Robotham - Chief Engineer}/HH. Ev.{Ivan Evernden - coachwork}1/JH.24.5.40. re Revised Buick Type Pivot. We have already sent to you PL.167 shewing a scheme for a Buick type of pivot for the Senior Range. This scheme entailed a separate cover to exclude water from the brakes filling the gap between the brake carrier plate and the pivot forging. At the suggestion of Mr. Parnell of Lockheed's it was decided to try a revised scheme in which the carrier plate itself would be dished to pass round the pivot and from the water shield. The main reason for this was to enable common front and rear brake carrier plates to be achieved on Rippletto, when this car had an axle which we are designing. On PL.229 we show our proposals. The advantages over PL.167 appear to be as follows :- (1) Elimination of water shield pressing. (2) Better joint between pivot and water shield. (3) Easier machining of cross steering lever bosses on the lever. (4) More rigid connection on pivot for cross steering lever attachment. (5) Common front and rear brake carrier plate can be had on Rippletto. (6) Better shape of carrier plate for Rippletto and elimination of awkward water shield pressing on Rippletto front brakes. The disadvantages appear to be :- (a) More expensive and heavier brake carrier plate on Senior Range. (b) More difficult and less eyeable cross steering lever forging. The detailing of PL.167 we understand should not be held up and Rm.{William Robotham - Chief Engineer} will decide whether and when PL.229 P.T.O. | ||