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 graph and table showing the efficiency of a well-oiled Bowden cable under various angles and loads.
| Identifier | ExFiles\Box 13\1\ 01-page72 | |
| Date | 21th December 1934 guessed | |
| PERCENTAGE EFFICIENCY % EFFICIENCY OF BOWDEN CABLE READINGS TAKEN WITH CABLE WELL OILED Graph data: Curve 1: M = 0.264, ANGLE = 16° Curve 2: M = 0.282, ANGLE = 60°, MEAN DIA = 7.0" Curve 3: M = 0.214, ANGLE = 90°, MEAN DIA = 4.2" Curve 4: M = 0.214, ANGLE = 180°, MEAN DIA = 1.5" Table data: ANGLE CHANGE OF DIRECTION OF FORCE | 180° | 90° | 60° | 16° EFFICIENCY AT 300 LBS. INPUT LOAD | 51 | 71.5 | 78 | 93 COEFFICIENT OF FRICTION AT 300 LBS. | .214 | .214 | .282 | .264 EFFICIENCY AT MAXIMUM LOAD | 49.5 | 72.5 | 79 | 86 EFFICIENCY AT "PULL OFF SPRING" LOAD | 41 | 62 | 70 | 70 | ||