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).
List of particulars for a sequence starter motor system for S.S. production.
| Identifier | ExFiles\Box 64\4\ scan0254 | |
| Date | 25th April 1929 | |
| X 7655 EFC/T25.4.29. PARTICULARS OF SEQUENCE STARTER MOTOR SYSTEM FOR S.S. PRODUCTION. (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 3.100/3.00 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 functioning as the armature 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 .600" or a total armature travel of .775. (9) Main armature spring D.72159 of long low rate to our specification Z with a rate of 3 1/4 lbs. per inch to provide an initial set-up force of 5.75 lbw. (10) Pinion clearance from wheel in disengaged position .175", i.e. equal to damper travel. Contd. | ||