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).
Blueprint for experimental piston ring type springs to replace plungers in a synchro-mesh system.
| Identifier | ExFiles\Box 104\4\ scan0277 | |
| Date | 11th March 1937 | |
| EXCEPT FOR THE 3 DETAILS QUOTED ALL OTHER PIECES ARE STANDARD TO 20/25 & BENTLEY. 3 HOLES, EQUALLY SPACED, IN EACH RING GROOVE. WHEN ASSEMBLED AS SHOWN & WELL OILED THE INNER SLIDING PIECE SHOULD PULL OUT UNDER AN AXIAL LOAD OF 30-36 LBS. THIS IS THE FRICTIONAL DRAG WHEN THE RINGS ARE OUT OF THE GROOVES. SHOULD BE CHECKED BEFORE ASSEMBLING INTO A GEARBOX. ANTI-RATTLERS & CAMS ARE UNALTERED. SECTION AA.{D. Abbot-Anderson} NOTE THE SCHEME DELETES 6 PLUNGERS, 6 SPRINGS & 12 HOLES FROM THE INNER SLIDING PIECE & SUBSTITUTES 2 SPRING RINGS & THEIR GROOVES. NO LIGHTENING HAS BEEN DONE AS WE MERELY WISH TO TEST THE RINGS AT THIS STAGE. THE STRESS RANGE IN THE SPRINGS IS 77,200 - 102,000 LB/SQ". EXPERIMENTAL PISTON RING TYPE SPRINGS TO REPLACE PLUNGERS - SYNCHRO-MESH SCALE 1/1 N&H 5065 RS.{Sir Henry Royce's Secretary}458 RS.{Sir Henry Royce's Secretary}456 RS.{Sir Henry Royce's Secretary}457 RECEIVED W-ROYCE LTD HUCKNALL d'Asworth 10/3/37 | ||