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).
Modification to the J.3. road shock dampers to increase damping by increasing the valve dashpot diameter.
| Identifier | ExFiles\Box 178\3\ img275 | |
| Date | 14th July 1932 | |
| BY.{R.W. Bailey - Chief Engineer} ) FROM HDY.{William Hardy} HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} ) C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} [Text struck through] J.{Mr Johnson W.M.} 3. ROAD SHOCK DAMPERS. X5520. We send herewith N. sch. 3495. shewing a modification to the valve dashpot to give more damping. The dashpot dia. is increased from .525 to 1" giving 5.5 times more damping. If this is too much it can be reduced by drilling the piston, not by giving increased clearance in this case as the piston has to help guide the valve. For a temporary experiment the valve and its guide can be shortened, the dashpot fit the bore of the control cylinder and external piping connect the space between the dashpot and the control piston to the reservoir, the existing inclined hole being plugged. Needless to say effective damping is dependent upon the elimination of air from the system [handwritten "dashpot" above strikethrough "system"]. Would BY.{R.W. Bailey - Chief Engineer} kindly let HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} have a print as soon as possible. HDY.{William Hardy} | ||