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 various clutch experiments and their respective setups.
| Identifier | ExFiles\Box 103\1\ scan0131 | |
| Date | 10th September 1934 | |
| +5300 10.9.34. CLUTCH EXPERIMENTS. 21-G-IV - C.14. Rubber Mounting. New clutch, thin flywheel, fabric on pressure plates, no movement of back plate, .025 set in driven member, RAD.11, two links in front of engine. 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. Roller prop. shaft sliding joint. B-1. Disc flywheel. B. & B. centre. To be followed by Terraplane cork clutch. 23-AE - B-10. (Narrow Pin Unit) Rubber Mounting. New clutch. Fabric on driven member. .025 set. To be followed by disc flywheel and plain centre. 20-G-IV - C.12. Rubber Mounting. Std. flywheel. Spring loaded link to pedal shaft. One link in front of engine. | ||