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).
Graph comparing percentage power loss versus exhaust back pressure for B60 and BV engines at a constant 4000 RPM.
| Identifier | ExFiles\Box 124\1\ scan0060 | |
| Date | 30th March 1939 guessed | |
| COMPARISON OF EXHAUST BACK ON B60 & BV ENGINES TESTS TAKEN FROM CONSTANT 4000 RPM (S 81) B60 - OPEN EXHAUST 139 BHP CONDITIONS AS CURVE (S) BV OPEN EXHAUST 125 BHP PERCENTAGE POWER LOSS TO OPEN EXHAUST BACK PRESS INS HG 25 20 15 10 5 5 10 15 20 | ||