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).
Blueprint of Phantom II resonance silencers for a semi-expanding carburetter, showing two design variations with their dimensions and performance data.
| Identifier | ExFiles\Box 152\3\ scan0101 | |
| Date | 28th November 1932 guessed | |
| B P.II RESONANCE SILENCERS FOR SEMI EXPANDING CARBURETTER. HS{Lord Ernest Hives - Chair}/780 ③ 3.5" 10.25 2.813 5.875 HOLES AS ① & ② CAPACITY OF RESONANCE PORTION OF SILENCER 300 CU. INS. POWER LOSS. NIL ON PII ④ 15.0' 7.0" 5" 6.5" 4.5" 2.687 CAPACITY OF RESONANCE PORTION OF SILENCER 240 CU. INS POWER LOSS 2.687 DIA INTAKE 1.3 B.H.P AT 3500 R.P.M 12 .5" DIA HOLES 2.562 DIA INTAKE 2.7 H.P. AT 3500 R.P.M. 24 .5" DIA HOLES | ||