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).
Modifications to the servo drive for the Spectre & Wraith gearboxes.
| Identifier | ExFiles\Box 94\1\ scan0051 | |
| Date | 29th October 1934 | |
| To BY.{R.W. Bailey - Chief Engineer} Copy to Mr.Hs.{Lord Ernest Hives - Chair} Mr.RMG. +4491 325 HDY.{William Hardy}1/MN.29/10/34. SpectreCodename for Phantom III & Wraith Gearboxes. Servo Drive. Referring to the washer G 54667 which is provided on the servo drive arrangement on the SpectreCodename for Phantom III to enable the ball bearing 125 AC to be driven out of the casing, will you kindly delete this and enlarge the bore of the lip which retains the bearing to 1.800 + 10 so that sufficient of the outer race will project to allow of the use of a drift directly on the outer race. In the case of the Wraith our drawing N Sch. 4171 does not show any washer but the bore of the lip is too small as shown by us and should be increased to 1.625 + 10. This is to some extent a temporary figure as we have no accurate dimensions of the bearing yet. HDY.{William Hardy} | ||