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).
Performance graph comparing the C.I. and C.XI engine units over a range of RPMs.
| Identifier | ExFiles\Box 5a\5\ 05-page176 | |
| Date | 25th October 1931 | |
| COMPARISON OF C.I. UNIT WITH 5.70 C/R & C.XI UNIT FOR 10,000 MILES P.II COMPLETE SHORT TYPE SILENCER USED IN BOTH CASES C.I. UNIT 112' SHAFT. HIGH LIFT ROCKERS C.XI Sch 1542/3 CAMSHAFT PISTONS E 57122 STANDARD 15% LARGER CARB B.H.P. COMPRESSION PRESS LBS/SQ' R.P.M. WITH P.II. SILENCER B.M.E.P. IND: DEPN: INS: HG | ||