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).
The design and fitting of a 1-G-1 type spring drive damper to a G.11 engine.
| Identifier | WestWitteringFiles\Q\2-July1927-September1927\ 7 | |
| Date | 5th July 1927 | |
| To R.{Sir Henry Royce} from hs{Lord Ernest Hives - Chair}/Tsn. [Struck through] C. to Dr. Wer. [Struck through] C. to RG.{Mr Rowledge} [Struck through] ORIGINAL. Hs{Lord Ernest Hives - Chair}/Tsnl/LG5.7.27. 1-G-1 TYPE SPRING DRIVE ON G.11. X4222 X634 With a view to ascertaining the true value of 1-G-1 type damper we have made and fitted a damper of this type to G.11. The principal advantage of the G.1. type of drive over the standard is that there is practically no unsprung weight on the nose of the crankshaft. It was not possible to abolish entirely the unsprung weight from the nose of the Goshawk crankshaft but we have reduced this to the minimum obtainable with a standard crankshaft. The new drive is as far as possible a copy of G.1. in that the torque to drive the auxiliaries is transmitted by springs and damping plates in parallel. The driving pinion is in one with the flywheel of the damper and therefore rotates with very uniform velocity. Being unwilling experimentally to spine the end of the crankshaft for the driving plates, we fitted an adaptor to the shaft taper. This explains why the unsprung inertia is not negligible as in 1-G-1. Particulars are shewn as follows for comparison :- contd :- | ||