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).
Preliminary development test report for 'R' engine number R27, intended to inform 'Griffon' engine design.
| Identifier | ExFiles\Box 179b\3\ img287 | |
| Date | 28th February 1933 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Yng. c. to Sg.{Arthur F. Sidgreaves - MD} Tor. c. to Rg.{Mr Rowledge} By.{R.W. Bailey - Chief Engineer} c. to Lr.{Mr Ellor} EP.{G. Eric Platford - Chief Quality Engineer} c. to Mr. Jaques. (ORIGINAL) Hs{Lord Ernest Hives - Chair}/Yng.6/MJ.28.2.33. x+649 x+676 PRELIMINARY TESTS IN CONJUNCTION WITH "R" ENGINE TYPE DEVELOPMENT TEST. ENGINE NO. "R" 27. A 100 hours development test generally under Type Test conditions for Normal Category engines, as laid down in I.P.1208 Design Leaflets C.1-3, is being attempted in order to gain knowledge applicable chiefly to 'Griffon' engines. The rating for the test is - 1500 BHP. at 2750 R.P.M. - at ground level. The engine was built to 1931 Schneider Race standard except for the following - Main bearings to E.37437/8/9/40 Grooved to Ex.10457 having increased clearance and being lined with R.R. Lead Bronze. Big end liners to Ex.6659 - R.R.Lead Bronze lined. Big end bushes to Ex.6657 - R.R. Lead Bronze. 7.0394 supercharger gears - fitted to enable the engine to run at 1500 BHP. without undue throttling - these were 1929 Schneider Race standard. The bleed hole in the high pressure oil relief valve was increased to .137" dia. in order to supply more oil to the auxiliaries since the main oil pressure was considerably reduced due to the increased clearances and grooves in the main bearings. (It should be noted that increasing the strength of the main oil pressure relief valve spring had no effect on the oil pressure.) Preliminary tests were made before starting the endurance to decide what fuel would be necessary and also to establish the carburetter in a suitable form for satisfactory functioning under the conditions called for. As a result of these tests the fuels specified were - (1) D.T.D.134 plus 3 cc's. TEL/Gall. for running at and below 1500 BHP. at the International Speed. | ||