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).
Weight and thickness of cast iron brake drums.
| Identifier | ExFiles\Box 179\1\ img115 | |
| Date | 24th November 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} Copy to BY BRAKE DRUMS. X4612. With reference to HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}3/WJ141121., we should like to make the following remarks: (1) Cast iron is normally about 10% lighter than steel, but the figures you give shew a difference of under 2%. Is this due to the cast iron or is it due to increased thicknesses somewhere? (2) We have not the details of the ribbed drums fitted to Phantom but we have those proposed for J.{Mr Johnson W.M.} 3. and we notice that they are slightly thicker than we had in mind in making the N. scheme - that is to say - the drum itself instead of being .1875 is .225; the ribs instead of being .075 are .1". We wonder whether the Phantom drums are also slightly on the thick side? DA.{Bernard Day - Chassis Design} | ||