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).
Decision to use a squared location for the Wraith III rear stabiliser levers instead of a splined attachment.
| Identifier | ExFiles\Box 118\3\ scan0079 | |
| Date | 10th March 1938 | |
| To. By & Rm.{William Robotham - Chief Engineer}....From RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister} [Handwritten initials: RB{R. Bowen}] REAR STABILISER - WRAITH III. [Handwritten: 1073] Referring to By/NS.{Norman Scott}1/G.23.2.38., it has finally been decided that the squared location for levers on the above shaft to FCD.260 offers a more practicable assembly for production purposes than the splines attachment to LeC.5501. The principal reasons for this decision are :- (1) difficulty of hobbing the splines accurately to size on a production basis and (2) excessive cost of spline cutting fixture which we understand may be used for only 100 chassis, due to probable changes in design. (3) Assembly troubles due to pressing on levers with .005 diametral interference. The quantities produced at R.R. are insufficient to permit selective assembly for ensuring a definite interference, this being only possible with a large output. We, therefore, consider that the roll rod with the squared location to FCD.260 should be instructed for the first 100 chassis, and have confirmed that we are not committed to any material for the splined type roll rod. RHC{R. H. Coverley - Production Engineer}/S.Bannister. [Signature] | ||