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).
Test report on torque reaction damper settings for the Diamond Mounting Phantom II on model 25-EX.
Identifier | ExFiles\Box 11\3\ 03-page388 | |
Date | 4th July 1931 | |
To Hs.{Lord Ernest Hives - Chair} From Hs{Lord Ernest Hives - Chair}/Les Hotel de France, Chateauroux, France. DIAMOND MOUNTING P.II. LeC.2910/11 TORQUE REACTION DAMPER SETTINGS ON 25-EX. We are pleased to be able to confirm previous results that show that although these dampers govern :- Jellying, Torque Reaction, Booms and relative frame engine movement, the setting does not have to be accurate. We have carried out tests with the following damper settings (1) Dampers dead loose. (2) 100 lbs load on damper springs. (3) 250 lbs load on damper springs. (4) Dampers dead solid. We feel test (3) 250 lbs load on the springs would be the most satisfactory compromise for 25-EX in this country. Test (1) Dampers dead loose. (a) Torque reaction at 9.5 m.p.h. Flaps the front wings and this vibration causes a shudder and boom in the car. (b) Relative movement of the gear lever shows every explosion of the engine at torque reaction speed. (c) Jellying of lamps and wings, gear lever and pedal movement are bad at low and high speeds. (d) High speed vibration is good. (e) Booms are absent. Test (2) Dampers set to turn when a load of 14 lbs be applied at 5.25" radius (73.5 lbs ins.) Load on spring (D.53020) being 100 lbs (a) Torque reaction at 9.5 m.p.h. causes the front wings to flap very slightly. This is the best setting for this complaint. (b) Jellying considerably improved, but gear lever and pedal movement thought to be too excessive for French bad roads. (c) Booms and vibrations are practically as good as previous test. The car would still be considered free from the former. | ||