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).
The efficiency tests conducted on a Bishop steering gear and an issue found upon dismantling.
| Identifier | ExFiles\Box 28\2\ Scan162 | |
| Date | 27th March 1933 | |
| 27.3.33. TESTS ON BISHOP STEERING GEAR. The steering gear as received from the makers was fitted to gether and suitably mounted so that the steering column was horizontal and the weights could be hung on the drop arm (in the middle position) and on the rim of the steering wheel. (1) The "Forward Efficiency" and (2) the "Reversible Efficiency" were measured by (a) hanging a definite weight on the drop arm (in the middle position) and measuring the load on the steering wheel necessary just to move it, and (b) hanging a definite weight on the steering wheel arm and measuring the weight on the drop arm necessary just to move it. The overall efficiency velocity ratio was measured (the ratio is constant over the whole of movement). On dismantling the gear it was found that the pin in the drop arm spindle crank, which engages with the worm and should rotate freely, had seized in its bush - although subsequently freed, it refused to rotate under load (presumably due to eccentric loading of its short bush). The results are shown on accompanying sheets. Hs{Lord Ernest Hives - Chair}/C.S. Steadman. | ||