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).
Low efficiency test results of a new Peregrine worm and nut steering mechanism.
| Identifier | ExFiles\Box 169\3\ img055 | |
| Date | 16th March 1933 | |
| P.I. To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}13/KT.16.3.33. PEREGRINE STEERING. We have tested the new worm and nut steering now fitted to Per.4. for efficiency. Attached is a copy of the results. You will observe that nowhere is the efficiency of the steering higher than 54.%. The Phantom efficiency under similar conditions is 75%, and as this nut has actually a higher helix angle, its efficiency should certainly not be below 75%. Will you therefore please see what can be done to improve the mechanism of F.100894. It is of course possible that the worm and nut may not be at fault, but we have never previously found any appreciable loss of efficiency elsewhere. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||