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).
Specifying the wheel jack requirements for the Phantom II and 20 HP models.
| Identifier | ExFiles\Box 17\7\ Scan044 | |
| Date | 27th September 1929 | |
| To By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/AJL. Y7810. Hs{Lord Ernest Hives - Chair}/AJL.1/MJ.27.9.29. Y7810. X5810. Wheel Jack Requirements for Phantom 11. and 20 HP. (51 in O series onwards). Phantom 11 :- The following dimensions are essential to cover all possible conditions on the Phantom 11 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 11, 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. | ||