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 specifications for front pivots to reduce weight while maintaining strength.
| Identifier | ExFiles\Box 2\B002_X168\ 00000001-page049 | |
| Date | 30th March 1913 | |
| From F.H.R., Copies sent to: Mr. Johnson. Mr. Wormald. Mr. Spinney. Front Pivots. We must not make these front pivots heavy and we must not forget that it is no use their being much stronger than the cross tube or the spherical joints. I think, perhaps, that it would be better if the cross steering tube were the weakest point. You will also notice from the stub axle that it can be considerably lighter without being any weaker, in fact, if it is made of uniform strength it will be stronger. It should be cored out parallel to suit the 2.135 diameter, then another part parallel for the 1.968 size, then taper until it reaches the point which is 1.375 diameter, then parallel again by drilling until it approaches the screwed part. The weakest spot is now where it is bored 1.437 and ground for the larger ball-race 2.968. I think that it will be most practical to take this dimension which I work out to be .531 as the difference between the inner and the outer bore. This will make the parallel bore at the small end .844. F.H.R. [Stamp] RECEIVED [Handwritten] Mr Wormald. See Blue Print returned. X68 | ||