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).
Further tests on a Bishop steering gear with an altered velocity ratio, detailing forward and reverse efficiency.
| Identifier | ExFiles\Box 28\2\ Scan178 | |
| Date | 17th May 1933 guessed | |
| FURTHER TESTS ON BISHOP STEERING GEAR. The same tests as before were repeated, the gear having had its velocity ratio altered to approx. 14/1. Forward Efficiency. Drop arm radius:- 8". Radius of application of steering wheel load:- 7 3/4" Velocity ratio :- 14.4/1. Load on Drop Arm (lbs) | Load on Steering Wheel Arm (lbs) | Drop Arm Torque (lbs.ins) | Steering Wheel Torque (lbs.ins) | Efficiency % --- | --- | --- | --- | --- 50 | 8.75 | 400 | 66.7 | 41.7 100 | 15.88 | 800 | 121.0 | 46.9 150 | 21.69 | 1200 | 165.3 | 50.4 200 | 29.50 | 1600 | 225.0 | 49.4 250 | 35.94 | 2000 | 274.0 | 50.7 300 | 43.88 | 2400 | 334.5 | 49.9 350 | 51.13 | 2800 | 389.5 | 50.0 Reverse Efficiency. 150 | 2.50 | 1200 | 19.06 | 22.85 200 | 3.63 | 1600 | 27.66 | 24.90 250 | 4.31 | 2000 | 32.80 | 23.60 300 | 5.25 | 2400 | 40.00 | 24.00 350 | 5.88 | 2800 | 44.80 | 23.05 NOTE. Velocity ratio measured from helix angle:- 14.5/1 " " " overall:- 14.3/1 " " " by 1/4" movement each side of central position:- 14.4/1 ... mean value = 14.4/1. | ||