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).
Design and preference for double vertical piston type hydraulic dampers.
| Identifier | ExFiles\Box 55\4\ Scan421 | |
| Date | 15th December 1930 | |
| DA{Bernard Day - Chassis Design}/HDY.{William Hardy} FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} (At Le CanadelHenry Royce's French residence.) C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} C. to BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} X235 R1/M15.12.30. CAR WORK - re. HYDRAULIC DAMPERS. DOUBLE VERTICAL PISTON TYPE. At the moment we prefer this type because there is no reversal of forces on the main bearing, and we can keep all the slack out of the pistons and their lever connections. HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} has tested the single piston vertical ones used on the front of P. 2. and thinks the side corresponding to the above type is the most efficient specimen he has tested for short stroke efficiency. The design was giving us some trouble because we thought we must keep the pistons from turning round. This seems to be satisfactorily solved by the stirrup type of connection with DA{Bernard Day - Chassis Design}/HDY{William Hardy}'s single central spring. This came to my mind during the night before I left, and I sent a note and sketch by Mr. Marmont (to DA.{Bernard Day - Chassis Design} only.) Further sketch with explanations of this and additional features here attached. (Sheet 1.) | ||