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 of resonance silencer exhaust tests comparing BHP and back pressure against RPM.
| Identifier | ExFiles\Box 14\6\ Scan257 | |
| Date | 20th April 1927 | |
| P.I. 25 UNIT PHANTOM II COMP. RATIO 5.25:1 N.W. (U.S.) CAMSHAFT SEMI-EXPANDING CARBS RESONANCE SILENCER EXHAUST TESTS RM{William Robotham - Chief Engineer} P 59 P.F. EXH. BACK PRESS. "Hg" B.H.P B.M.E.P. R.P.M. KEY: 1) OPEN EXHAUST 2) SILENCER H.{Arthur M. Hanbury - Head Complaints} 647 3) AS (2) SWAN-NECK & FISH TAIL REMOVED 4) P.I. (LONG TYPE) SILENCER 5) P.I. (SHORT TYPE) SILENCER 6) C.O. OPEN AS (5) 7) AS (3) TWO FRONT BAFFLES REMOVED TIMING HS{Lord Ernest Hives - Chair}1 20-4-27 R.{Sir Henry Royce} | ||