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).
Endurance test report on an F.11 No.33 supercharged engine.
| Identifier | ExFiles\Box 36\2\ scan 170 | |
| Date | 1st May 1928 | |
| RG.{Mr Rowledge} from Hs{Lord Ernest Hives - Chair}/TAG. Hs{Lord Ernest Hives - Chair}/TAG1/LGA. 5.28. X2934 F.11 No.33 - SUPERCHARGED. X4657 2 hrs. Endurance test. A.I.D. observed. Engine fitted with - standard crankcase and bearings, standard conn. rods, oil pump with full width gears, pistons 6/1, perfect circle ring at skirt. Supercharger Unit No.11., strengthening bolts to DES.965 in casing, modified tail end oil bearing scheme, 10/1 ratio. Engine on test. During the official 2 hrs. the engine was run at 9/10ths. of 460 HP. and the last 5 mins. the throttle was opened to open the rated boost pressure viz: + .6 Hg. at normal barometer. these being the figures temporarily agreed to between the A.I.D. and RR. Prior to the official test the engine was run in for 24 hrs. at approx. 1000 r.p.m. For the first few mins. the return oil from the engine was collected in a bucket - the idea being that any swarf or dirt which may have been left in pipes etc. would be washed away in the first few minutes and would otherwise have been kept in circulation. The result of this was that we collected quite a lot of aluminium and phospher bronze swarf which was fine enough to have been maintained in circulation and thereby endangering the bearings. It is hoped shortly that all aero engines will be run on the rig with the De Laval cleaner before being tested. During the official test contd :- | ||