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).
Graph showing the mechanical efficiency of a Marles Type L7 steering gear under forward and reverse drive.
| Identifier | ExFiles\Box 28\3\ Scan122 | |
| Date | 27th February 1935 | |
| HS.{Lord Ernest Hives - Chair} 1793 MECHANICAL EFFICIENCY OF MARLES TYPE L7 STEERING GEAR. FIGURES TAKEN AFTER GEAR HAD BEEN RUN IN ON RIG FOR 2 HOURS. MID. POSITION RATIO 20.7 : 1. 3 3/4 TURN CAM. HELIX ANGLE = 8.62° 10.15" PENDULUM LEVER. GEAR LUBRICATED WITH PRICE'S AMBER B. Y-Axis: STATIC EFFICIENCY IN MID-POSITION X-Axis: LOAD AT END OF PENDULUM LEVER - LBS Graph line 1: FORWARD DRIVE Graph line 2: REVERSE DRIVE HK{Col. T. Harker - Sales} / 27.2.35 | ||