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).
Letter to the Gordon Armstrong Patent Suspension Co. Ltd. regarding damper squeaking and knocking issues.
| Identifier | ExFiles\Box 152\1\ scan0225 | |
| Date | 29th December 1936 | |
| Experimental Dept. Rm {William Robotham - Chief Engineer} /Les.2/JH. 29th December, 1936. The Gordon Armstrong Patent Suspension Co.Ltd., Waltham Works, Beverley. Dear Mr. Armstrong, Thank you for your letter of the 23rd. The squeak from the damper having the spring loaded valves occurs only on the rebound stroke. We find there is a certain amount of knocking from the damper when the oil gets warm. This appears to be chiefly from the side float of the connecting rods. They take up the opposite clearance on reversal of the stroke. We are trying to rig up a method for taking indicator diagrams of the complete damper. If this is successful it should be very useful. Yours sincerely, | ||