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).
Particulars of the sequence starter motor system for the 10,000 mile chassis 21-EX and 22-EX.
| Identifier | ExFiles\Box 64\4\ scan0219 | |
| Date | 16th March 1929 | |
| EFC X765 EFCl/T16.3.29. PARTICULARS OF SEQUENCE STARTER MOTOR SYSTEM ON 10,000 MILE CHASSIS 21-EX and 22-EX. (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 recently instructed by E.{Mr Elliott - Chief Engineer} (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) Longitudinal damper to LeC. design allowing .175" travel, the damper piston stop both ways. (6) Damper piston springs of equal rating to those originally instructed, but .175 greater free length to give greater force at every degree of compression. (7) .025" air release hole through damper piston. (8) Armature travel relative to piston of .525" or a total armature travel of .700". (9) Main armature spring D.71569 with .125" packing to give a spring + packing set up length of 3.700" and a set up force of 5.05 lbw. (10) Pinion clearance from wheel in disengaged position approximately equal to, but slightly less than damper travel of .175". Contd. | ||