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).
50-hour test bed run detailing issues with engine components.
| Identifier | ExFiles\Box 43\1\ Scan053 | |
| Date | 20th August 1924 | |
| H.R. 493A (EOH) (D.A. 652 20-8-24) J.H.D. -4- EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}3/LG19.8.24. be adopted i.e., introducing a fabric universal drive? A scheme of this sort would be much better than the one at present used as the laminated drive has always been a source of trouble on the Test Beds as the clearance allowed is onyl .004" between the drive and the magneto drum. On the last day of the test on the Hangar there appeared to be an enormous amount of crankcase pressure, the cause being presumably due to blowing passed the pistons - (see test bed report). TEST BED - 50 HRS. RUN. The engine was taken off the Hangar and rigged up on the test bed. The power was poor being 25 HP. below rated 360 corrected for barometer. Towards the end of the first 10 hrs. the back pressure became so bad that it was thought advisable to examine the pistons and cylinders. The rings of every piston were carboned up and the cylinders were perfectly dry, no sign of oil on the walls whatever. The pistons were cleaned and the rings freed. The power was improved but did not quite come up to the schedule. While the cylinders were off, several valves were taken out and the valve stems cleaned, being carboned up. Magnetos. During the 2nd. days running, after 65 hrs. a magneto failed (A.{Mr Adams} side, firing exhaust side plugs). The contact points were badly burnt. The magneto was sent to Mr. Ellis who re- ported that the winding had failed. contd:- | ||