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).
Weights of ribbed brake drums, comparing standard and cast iron versions.
| Identifier | ExFiles\Box 120\1\ scan0042 | |
| Date | 14th March 1931 | |
| Y4612. To Da.{Bernard Day - Chassis Design} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/MJ.14.3.31. RIBBED BRAKE DRUM WEIGHTS. We apologize for maligning the new brake drums in the conversation we had with you on Thursday. Actually, we had not got hold of the correct figures. We send you herewith the weights, which shew that we have only increased the weight of the chassis by about 13 lbs. DRUMS COMPLETE. Weight of Standard Front Drums = 28½ lbs. Weight of Cast Iron Front Drums = 34½ lbs. Increase = 6 lbs. Weight of Standard Rear Drums = 46½ lbs. Weight of Cast Iron Rear Drums = 53½ lbs. Increase = 7 lbs. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||