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).
Secret memo discussing Packard-type front suspension camber and caster adjustments for Bentley III and Phoenix models.
| Identifier | ExFiles\Box 100\1\ scan0011 | |
| Date | 23th June 1937 | |
| SECRET. 446 200B also 10 44 Da.{Bernard Day - Chassis Design} Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} E/EV.{Ivan Evernden - coachwork} E/EV{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} c. Rm.{William Robotham - Chief Engineer} E.1/HP.23.6.37. Packard type Front Suspension on Bentley III and Phoenix. This is to confirm the discussion with respect to camber and caster adjustments on the above scheme. Investigation shows that the jigging of the lower triangle pieces should lead to very little variation on production, and owing to the long base of the lower triangle there would have to be a difference in level of .375" between the front and rear fixings of the lower triangle to introduce an error of 1° in the caster angle. We have provided for adjustment of the front fixings by packing pieces, and if necessary packings can be used under the rear fixing, but we do not think this latter will be required. With regard to the upper triangle, it is agreed to go ahead without any adjustment in the outer end controlling the camber, but we will have ready designs of the Packard type of adjustment and an eccentric with clamped bolt. We realise that the Packard Co. went into production without an adjustment at the end of the top triangle, and afterwards introduced an adjustment at this point. Our present independent suspensions are built up without camber adjustments, and we know this can be done with the Packard scheme, but we are prepared to accept that an adjustment may be found necessary afterwards. We do not want however to introduce it until it is called for. Rm{William Robotham - Chief Engineer}/Les is in agreement with this policy, but he has undertaken to find out as much as possible from the | ||