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 a 40/50 crankshaft damper detailing experiments with varied loads to determine optimal damping.
| Identifier | ExFiles\Box 25\3\ Scan291 | |
| Date | 1st December 1927 | |
| X634 HS{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LGS.12.27. 40/50 CRANKSHAFT DAMPER. X634 X8010 Varied tests we have carried out with this damper on 10-EX. It was found that with the driving springs giving 8½ lbs. load when the damper came up against the stop and 16 lbs. damping at 17¾" radius, the driving segments repeatedly hit the stops when making a standing start or running very slowly on top gear. Otherwise the engine was not particularly rough. The damping was then reduced to 9 lbs. at the end of the 17¾" lever and ~~six~~ ~~driving springs~~ giving 20 lbs. load when deflected to the stops were incorporated. The result was that the whole engine was very much more rough and hitting the stops was more frequent. The damping was then increased to 18 lbs. with very beneficial results, the general behaviour of the engine being slightly better than in the first test. The damping was then further increased to 25 lbs. but the improvement was only very slight, in fact it could hardly be detected. We therefore assume that the optimum condition of the damping is 20 lbs. load and 20 lbs. damping springs. HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||