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).
Summary list of clutch experiments with different configurations and notes.
| Identifier | ExFiles\Box 103\1\ scan0114 | |
| Date | 2nd July 1934 | |
| X5300 2.7.34. CLUTCH EXPERIMENTS. 21-G-IV - C.14. New clutch, thin flywheel, fabric on pressure plates, no movement of back plate, .025 set in driven member. RAD.11 4-B-IV - B.7. New clutch, thin light flywheel, fabric on driven member, .015 set. .005 movement of back plates. VM. 20. 3-B-IV - B.9. New clutch, Donflex centre. B-1. Disc flywheel. B. & B. centre. B-10. New clutch, R.R. B. & B. centre. No movement of back plate. VM. 20. | ||