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).
Technical memorandum detailing specifications for front dampers, including valve cap depths and spring loads.
Identifier | ExFiles\Box 16\4\ Scan084 | |
Date | 1st April 1929 guessed | |
contd :- -2- FRONT DAMPERS. As R.{Sir Henry Royce} is suggesting that the low pressure load should be half that of the high pressure valve, we consider that it will be necessary to have two different depths of valve caps on the front damper as on the rear. This will enable us to get a greater range of loads. Will you therefore please arrange that the high pressure cap with a washer E.{Mr Elliott - Chief Engineer} .020" thick shall give a spring length d.{John DeLooze - Company Secretary} with the valve closed of .925" and that the depth F.{Mr Friese} of the low pressure valve cap shall be .085 less giving a normal spring length with the valve closed of 1.010", the washer W. again being .020". We consider that the springs F.54807 for the front dampers should be checked for rating on a model damper by being tried over the low pressure valve after being checked for free length. With a working length d.{John DeLooze - Company Secretary} of 1.010 they should give a ball end load of 70 lbs. ± 4. In view of the fact that R.{Sir Henry Royce} has decided that the dynamic restrictions are to be removed from the dampers, there is no doubt that the valve loads will have to be increased considerably, as the total energy to be absorbed by the damper to give car control is more or less a fixed amount. We therefore recommend that two springs should be got out giving a 50% greater rating than F.54807 and F.79384 respectively. They should give a 50% greater maximum load for the same max. stress. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||