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).
Measurements taken on a Wraith chassis to determine requirements for a new hydraulic jack.
| Identifier | ExFiles\Box 139\1\ scan0372 | |
| Date | 18th March 1937 | |
| TO DA.{Bernard Day - Chassis Design} c. to LID.{A. J. Lidsey} c. to E/LV. c. to Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} 1166 Wraith Jacks. The following measurements have been taken on the above chassis with a view to using the new hand operated hydraulic jack. All measurements were taken from the centre of the bumper bar, opposite the dumb-irons. FRONT. Normal position - bumper to ground = 16.000". One wheel on rim = 13.000". One wheel jacked up to give 2" clearance under tyre = 23.000". Rear. Normal position - bumper to ground = 16.500". One wheel on rim = 12.125". One wheel jacked up to give 2" Clearance under tyre = 25.500". We shall therefore require a jack giving a lift of 15 ins. We should be very pleased if you could let us have a design of bracket as soon as possible to try out on our Wraith No.1 Rm{William Robotham - Chief Engineer}/F.Dodd. | ||