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 modified H.T. ignition rotor, scheme 922.
| Identifier | ExFiles\Box 168\2\ img016 | |
| Date | 3rd October 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} 16119 Hs{Lord Ernest Hives - Chair}/Wst.5/JH.3.10.36. Modified H.T. Ignition Rotor to R.R. Scheme 922. We have now tested this rotor on the bench and also on a test bed engine and find that it is quite satisfactory, and should afford an increased margin of breakdown as compared with the standard rotor. Our test consisted of running a rotor on a standard distributor for a 100 hours at an equivalent engine speed of 4,000 R.P.M. immediately followed by a further running of 75 hours at an equivalent engine speed of 2,000 R.P.M. The H.T. discharge gaps were set as large as possible in order to subject the rotor to maximum voltage stress. Upon the satisfactory completion of these Bench tests the rotor was fitted to an engine on the Test Bed, and run for a period of 10 hours at an engine speed from 4,000 to 4,500 R.P.M. without failure. Rotors of this type are also fitted to experimental chassis and as soon as an aggregate 10,000 miles is complete we propose issuing a Standardisation Sheet for the same. Hs{Lord Ernest Hives - Chair}/Wst. | ||