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).
Scheme 2907 for a silent 3rd speed gearbox using a single and double helical arrangement.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan157 | |
| Date | 2nd June 1929 | |
| BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} Copy to SG.{Arthur F. Sidgreaves - MD} HS.{Lord Ernest Hives - Chair} ORIGINAL GEARBOX WITH SILENT 3rd. SPEED. X8310 X7310 X4510 We send herewith N. scheme 2907. shewing the arrangement of a single and double helical 3rd. speed in a standard Phantom gearbox, with the object of trying whether this arrangement gives us what we are seeking for in the way of silence. We have shewn it on a standard Phantom because EAC. 7. is already booked for the Salerni coupling experiment, and we thought difficulties might arise if we attempted to put these two quite distinct experiments on the same box, but it is obvious that it can be used on EAC.7. if desired. As the experiment seems to us to be a simple one we suggest that it could be got going very quickly. As shewn the teeth of the two sides of the double helical are of the same pitch. We are providing an alternative wheel having different pitches on the two sides. DA.{Bernard Day - Chassis Design} | ||