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).
Procedural document outlining changes to spring specifications and acceptance testing for cars.
| Identifier | ExFiles\Box 47\2\ Scan369 | |
| Date | 1st November 1930 | |
| -2- He/AL.3/Al.1.11.30.Contd. springs; there is no other alternative. To ensure that future cars do not suffer similarly, the following procedure should be adopted.- (a) Fit stronger springs initially (this has already been done, cars are now sprung to give a rear buffer clearance of 3.350" as against 3.600" previously for the same conditions of load). The front springs are unaltered, they do not give trouble. (b) Every effort should be made to enable the works to obtain a closer estimate of the weight of the body to be fitted to each chassis. (c) As much information as possible should be given to the works regarding the average number of passengers to be carried. If luggage will be carried frequently, and how much. Lastly, but very important, the manner in which the car is to be used - if it is purely a town carriage, or if the owner is a speed merchant who frequently visits the Continent, etc. Sales can help tremendously in this respect. (d) Cars for the Continent should have stronger springs (This also is now in operation 50 lbs. stronger front springs and 100 lbs. rear are being fitted over and above the increase in rear spring strength for all cars). The acceptance test of new completed cars must make a point of ensuring that the buffer clearances are not under our specified limit of 1.750" front and 3.350" rear, the car being loaded up to its average passenger load (i.e. if a seven seater - four passengers) and 50 lbs. luggage. These figures for Continental cars become 1.875" front clearance and 4.100" rear. The effect of the palliative for this complaint cannot of necessity be shewn immediately owing to the large number of cars with too flexible springs in the hands of customers. | ||