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).
Wheel jack requirement specifications for the Phantom II and 20 HP models.
| Identifier | ExFiles\Box 106\4\ scan0119 | |
| Date | 27th September 1929 | |
| X5810 To By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/AJL. HS{Lord Ernest Hives - Chair}/AJL.1/WJ.27.9.29. x7810 x5810 Wheel Jack Requirements for Phantom II. and 20 HP. (51 in O series onwards). Phantom II :- The following dimensions are essential to cover all possible conditions on the Phantom II chassis as at present fitted with 33 x 6.75" tyres on 21" rims. Minimum height of jack not greater than 5.5" Maximum height of jack not less than 16.0" The difference between these two dimensions i.e. 10.5" is to be made up as follows :- By mechanical or hydraulic effort 7.50" By initial hand adjustment 3.00" 20 HP. (51 in O series onwards). The dimensions required for this chassis as at present fitted with 6" tyres on 19" rims are practically identical to those necessary for Phantom II, they are :- Minimum height of jack not greater than 5.75" Maximum height of jack not less than 16.00" Mechanical or hydraulic lift 7.25" Initial hand adjustment 3.00" Hs{Lord Ernest Hives - Chair}/AJL. | ||