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).
Modifications to brake straps, linings, and clutches for Phantom II and 20/25 models.
| Identifier | ExFiles\Box 141\3\ scan0239 | |
| Date | 21th December 1933 | |
| - 2 - Phantom II Brake Straps. -------------------- (1) Front Brake Straps - G.80662/3 - The modification to the boss shown on this drawing is agreed to and the strap thus becomes suitable for bifurcated rivetting. if Sft.{Mr Swift} is satisfied that the bottom flange of the shoe does not prevent the anvil of the machine from connecting squarely with the rivets. There is less room on this strap than on the sample strap G54140 (20/25 HP). (2) Front Brake Auxiliary Strap. - G.80665/6. The modifications shown here are agreed to. (3) Rear Foot Brake Straps. - G.80658/9. The modifications shewn here are agreed to. In this case also Sft.{Mr Swift} should check up that the anvil will engage squarely with the rivets. (4) Rear Foot Brake Auxiliary Straps G.80664. - The modifications shewn on this drawing are agreed to. (5) Rear Hand Brake Straps. G.80660/1. - This as drawn will not be satisfactory owing to the necessity of clenching the rivets over in the radius of the flange. It will be necessary to add bosses on these straps, even then it is doubtful if the machine will cope with it owing to the narrow rivet spacing and the wide bottom flange. Sft.{Mr Swift}will be able to decide upon this. Brake Linings. The modifications to the brake linings necessitated on both cars have been examined and agreed. Clutch. ------- 20/25 The only modifications necessary on this section is the increase in diameter of the rivet counterbore. This is agreed to. Phantom II ---------- The modifications in this case include using smaller diameter rivets, the object of this being to enable one rivetting machine to cope with the complete range of brake straps and clutches. We agree to this modification. The clutch rivets are not called upon to transmit any torque above that caused | ||