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).
Results of an engine acceptance and endurance test, including a failure analysis of a flexible drive.
| Identifier | ExFiles\Box 178\4\ img002 | |
| Date | 23th May 1932 guessed | |
| -2- Test (b) was run simultaneously with a detonation test which was being carried out on the engine as a supplement to the evaporatively cooled type test on K.II.MS.39. (a) Acceptance Test. This test was run off as follows:- 2 hrs. Light running. 1 hr. 55 mins. 472 BHP. 2250 R.P.M. } Standard 2 hrs. 4 " " 325 " " } endurance for 1 " " F.T. " " } M.S. Kestrel. and in addition 2 mins. 450 BHP. 2700 R.P.M. (b) Endurance Test. 1st Attempt. 1 hr. 20 mins. 2100 RPM. - shut down due to failure of the flexible drive. 2nd Attempt. 20 hrs. 2100 RPM. 20 accelerations from 500 to 2100 R.P.M. 10 backfires. Total running time under load - 23 hrs. 22 mins. Results. The points for comment are :- (a) The failure of the flexible drive. (b) A very slight slip which occurred during the first ten hour run. (c) The strip condition of the drive. (d) The functioning of the electrical equipment. FAILURE OF THE FLEXIBLE DRIVE. It will be seen from photograph A, that the dynamo was mounted at approx. 45° to the axis of the crank-shaft. This gave a radius of curvature of about 3 feet to the drive. The failure occurred about 2" from the adaptor on the driving end, which is the most heavily loaded point, having to transmit the dynamo torque and also the resistance to the driving torque imposed by whatever friction may occur between the cable and the casing. The drive cable consists | ||