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 of steering and castoring efficiency for a Marles-Weller Type O Standard gear.
| Identifier | ExFiles\Box 28\2\ Scan048 | |
| Date | 30th August 1932 | |
| MARLES-WELLER GEAR TYPE O STANDARD HELIX ANGLE: 10° 30' RATIO: 13.5 : 1 ADAMANT ENGINEERING COMPANY LIMITED LUTON BEDS 30TH AUGUST 1932 Y-AXIS: EFFICIENCY % (A) STEERING EFFICIENCY (FORWARD) (B) CASTORING EFFICIENCY (REVERSE) GEAR EFFICIENCY UNDER IMPACT ON DROPARM (REVERSE) X-AXIS (TOP): (a) & (b) TORQUE INCH/LBS. | 250 | 500 | 750 | 1000 | 1250 | 1500 X-AXIS (BOTTOM): (c) IMPACT LBS. | 10 | 20 | 30 | 40 | 50 | 60 | ||