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 for a 4 1/8' bore, 6' stroke gas engine, plotting B.HP, Torque, and Consumption against engine R.P.M.
| Identifier | ExFiles\Box 134\5\ scan0002 | |
| Date | 23th December 1939 | |
| IF IN DOUBT, ASK. ASPIN B.H.P. ENGINE R.P.M. lbs. LOAD. POWER WITHOUT BEARINGS TORQUE CONSUMPTION 140 B.M.E.P. 130 B.M.E.P. 120 B.M.E.P. 110 B.M.E.P. BAROMETER. - 28.8" COMPRESSION PRESSURE. @ 360. R.P.M. - MOTORED = 400lb / ☐" CALORIFIC VALUE OF GAS. 450. B.T.U.s. GROSS - 417. B.T.U.s. NET. PER. CUB. FT. OFF PER ENGINE. ORDER DATE GAS ENGINE. 4 1/8 BORE 6" STROKE. F.{Mr Friese} M.{Mr Moon / Mr Moore} ASPIN & CO LTD ELTON, BURY. DATE 23-12-39 SCALE DRAWN H.B-st MATERIAL TRACED APPRD. ENGINE SERIES. DRWG. NO D.333. | ||