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).
Specifications for a car jack system and issues with existing models.
| Identifier | ExFiles\Box 37\3\ scan 077 | |
| Date | 17th February 1930 guessed | |
| MINIMUM HEIGHT. = 6.000ins. or a little less if possible. Hydraulic lift = 5.750ins. plus .500 for extra deflexion of rear tyres Extension. = 6.250.ins. At least 3.000ins. but more if possible. These figures agree with those you have given except in (1) We only allow 1.000ins. for soft earth. (2) We do not cater for a lost cover. There will be no difficulty in getting a jack to these requirements, and we are seeing the Skyhi people this week. We would be glad if you would give us your remarks after considering carefully our suggestions. We would point out that whilst you will not agree to a hydraulic jack with a minimum height of less than 5.500ins, you have passed the Dunlop, we presume, and that is, according to your stating, 6.300ins. With respect to your remarks re Da{Bernard Day - Chassis Design}/Ev{Ivan Evernden - coachwork} being stuck on the road on a dark wet night with a jack that will not lift the car, he has experienced this, though not because of the lift of the jack, but owing to the difficulty of placing the jack in position under the rear axle, on a car with a trunk and two wheels at the rear. It is very difficult to operate the Dunlop Jack in this position, and it is because of this that we are being asked for hydraulic jacks, and also the Jack-ALL System. We will keep you informed of any progress we are able to make and would welcome your valuable help. [Handwritten signature: EV{Ivan Evernden - coachwork}] [Handwritten note] We are looking into the Jackall System. as fitted to H.R.H. Prince of Wales' Car. | ||