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).
Recommendations for a sequence starter motor with damper, based on experiments on the 10,000 miles chassis 21-EX.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan166 | |
| Date | 6th March 1929 | |
| To BY.{R.W. Bailey - Chief Engineer} from EPC. c. to BY/RD. c. to RHC.{R. H. Coverley - Production Engineer} ORIGINAL EFC3/LG6.3.29. SEQUENCE STARTER MOTOR WITH DAMPER. V7625/EF The combination of items which we recommend as a result of our experiments, for incorporation on the 10,000 miles chassis 21-EX, is as follows :- (1) Wheel with sharp engaging tooth corners and rounded disengaging corners. (2) Pinion with sharp engaging tooth corners, rounded disengaging corners and backed off teeth as instructed recently by BY/RD8/ML21 29. (3) Motor with 3.100/3.000 taper armature with .012 final air gap and .175 distance short of full armature pole piece register when in fully engaged position. (4) 18 S.W.G. teazer winding of 36 turns. (5) Damper to LeC. design allowing .175" travel, the damper piston to function as the armature stop both ways. (6) Damper piston springs of rating as original design but .175" greater free length to give greater force at every distance. (7) .030" air release hole through piston boss as shewn to BY/RD. (8) Armature travel relative to piston of .525" or total of .700". contd :- | ||