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).
Design and weight-saving specifications for combined aluminium hubs and drums for B.V.
| Identifier | ExFiles\Box 141\2\ scan0350 | |
| Date | 19th April 1941 | |
| 1180 To Mr/H.H. from Rm{William Robotham - Chief Engineer}/GB. Copy to Rm{William Robotham - Chief Engineer}, Rm{William Robotham - Chief Engineer}/AHR. Rm{William Robotham - Chief Engineer}/GB.9/ET.19.4.41. COMBINED HUBS AND DRUMS IN ALUM. FOR B.V. ------------------------------------ An iron liner has been cast in an alum. drum and run with apparent success. The alum. drum weighs ...................13 lb. 12 oz. and a standard 5 rib iron drum weighs .......20 lb. 0 oz. This represents a saving on the car, of ..........25 lb. The above drum fits on the axle shaft flange on the rear axle. Its number is RG.{Mr Rowledge}2261 and the liner is RG.{Mr Rowledge}2260. We now want to make a single casting of the front hub and drum. The drum part of this should follow RG.{Mr Rowledge}2261, except that the radius at top of the fins should be reduced from .100" to .080". This will reduce the fin thickness by .040". The two tapped extractor holes are not required. The hub design should follow GB.4798, except for the differences shown in the attached sketch. The ball races should have an interference fit of .001" to .002" in the hub. Apart from the hub, the only new parts required are wheel bolts and an oil seal. If troubles, such as loosening of the races in the hub or wear on the wheel face occur, development much more intensive than is possible on the road, could be carried out on a slightly modified form of Kelsey Hays rig. This is shown in the attached sketch. Rm{William Robotham - Chief Engineer}/GB. G.B. | ||