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).
Test report on a slipping starter clutch, detailing issues, corrections, and performance results with different materials.
| Identifier | ExFiles\Box 26\4\ Scan107 | |
| Date | 20th July 1920 | |
| R.R. 199 (250T) (SD676 19-7-17) MP18086s X-31409 K719 To Hs.{Lord Ernest Hives - Chair} from RHC.{R. H. Coverley - Production Engineer} RHC{R. H. Coverley - Production Engineer}1/LG20.7.20. K18009 RE STARTER SLIPPING CLUTCH. We obtained a standard Clutch complete from the works as suggested and tested same and found it sustained a load of 600 lbs. and would only just move with hard jarring. On examination it was found that - 1. Clearances of G.6494 and G.6492 were incorrect. Scheme shews .010" which would mean .020" on the dia. Pieces only having .010" on dia. 2. Pieces N.4586 and N.4584 had been finally turned before recessing operation for Springs and when this operation was carried out the metal was forced out which left no clearance when clutch was assembled. When job had been examined and parts made O.K. and clearance increased to .020", we obtained the following results:- Red Fibre dry. Test 1 Clutch would slip with a load of 500 lbs. with slight jarring. Test 2 Steady movement with repeated jarring with a load of 400 lbs. Test 3 Slight movement with repeated hard jarring at 380 lbs. Red Fibre smeared with oil. Test 1 Slight movement with hard jarring at 380 lbs. Test 2 Steady movement (without jarring) at 440 lbs. Test with Ferodo. Clutch sustained a load of 800 lbs. Could only obtain slight movement with repeated jarring. RHC{R. H. Coverley - Production Engineer} | ||