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).
Report page discussing the gearbox design, body brackets, and step irons with comparisons to other models.
| Identifier | ExFiles\Box 127\1\ scan0255 | |
| Date | 20th November 1935 | |
| -13- Sft{Mr Swift}/Sctl/BH.20.11.35. Conversely the fitting up or other handwork must be considerably reduced before the cover is attached. The actual hand lever itself is of the most crude and common type, whilst we do not now use this type, we would ask that the old 20/25 HP. type be recalled as a comparison in design and workmanship. The lever knob is plain and there is no indication of any means whereby the reverse gear is prevented from engaging when not intended. It was noted that it is a three speed box, and what was specially noticed was the varying angles of the gear teeth. The continuous gears being a 45° Helix. The second speed gear being 40° Helix, and the third speed gear being 35° Helix. We believe that this ingenious arrangement contributes in a great measure to quietness. The increased thrust and load occurs here owing to the 45° Helix being somewhat counteracted by the higher speed of the continuous gears. Because of the lower speeds of the 2nd and 1st speed gears, and consequent greater thrust action due to greater tooth load, the Helix is reduced to 40° and 35° respectively. A synchromesh cone system is on the 3rd and 2nd gears and appears to be a simple type. BODY BRACKETS, STEP IRONS. INTERIOR FITTING ETC. Whilst this portion of the report may have been included in the frame report it was, because of the outstanding meagreness of the details employed, thought worth while to give it separately. On comparison with the Phantom III Body Brackets and Step Irons, those on the Packard are insignificant. They are of small proportions, the turn over of the pressings upon which the body rests having thick rubber strips on them and which are held by adhesive tape. The Step irons or footboard brackets are a simple sheet pressing, dished in its centre length for strength, one end is fastened to the lower web of the frame, at a convenient distance along the length of the pressing are other holes from which is taken a piece of flat stock bent at the ends, this flat stay being | ||