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).
Secret memo regarding a new, stronger fabric engine coupling disc for 'EAC' and methods for making its ferrules.
| Identifier | ExFiles\Box 66\4\ scan0128 | |
| Date | 1st April 1925 | |
| TO [REDACTED] from AJS. c.c. to [REDACTED]. c. to Hs. {Lord Ernest Hives - Chair} 18305 SECRET. RE FABRIC ENGINE COUPLING FOR EAC. We are sending you herewith a blueprint of Lec.2050 (original going to BY) of a disc coupling of considerably increased strength above the one which recently failed. We omitted to point out in our AJS1/DB. {Donald Bastow - Suspensions} 31.3.25 that Hardy's Representative considered that we should use a disc 1" in thickness (for their ordinary fabric) or twice that of the broken one for an engine coupling on EAC. His figures were based purely on engine torque. The thickness of this new coupling disc is .750, which, in conjunction with the increased number of fabrics per unit of thickness (as referred to in the above mentioned memo) we consider should give us round about 80% of what Hardy's would consider ideal strength for the job. In addition to this we are hoping to get some gain from the ferrule construction shown on Lec.2050, specially with the integral ferrule scheme. On the above drawing we have shown three methods of making the ferrules - 1. Integral with the re-inforcing plate. 2. Separate ferrule consisting of two tubes to obtain a shouldered effect. 3. Solid shouldered ferrule. We propose that 1 and 2 should be tried with the hope that No.2. will suffice owing to costing | ||