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).
Comparison of Lincoln, Spectre and Zephyr components, with a focus on the Gemmer steering system.
| Identifier | ExFiles\Box 173\4\ img144 | |
| Date | 11th December 1935 | |
| -2- The large Lincoln has a double choke downdraught carburetter feeding two four port systems. The float chamber vent is in the lid.{A. J. Lidsey} In the gearbox the pitch line backlash of a pair of gears is .007" to .010 and the chunking worse than any SpectreCodename for Phantom III. The Zephyr is also bad in this respect. The Gemmer steering people had almost exactly opposite views to Saginaw except in so far as advocating 1 lb pull on wheel due to end load of worm bearings and 2 lbs. due to lightness of roller in mesh. Tightness in the roller bearings they do not use, but have just gone for cheapness to needles for the roller and plain hardened thrust washers. The pin through the roller is electrically welded just tight, preventing distortion of the yoke which they consider very important. They use inside contact as giving better results with easier manufacture. The rocker shaft is soft mirror finished by the latest grinding stone and runs in oilite bearings. One useful idea they have is to use a triple Belleville washer with .010" movement to choc-a-bloc to give permanent end loading of the worm. Bronze boxes were said to undo any preloading. HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||