Graph comparing the performance of a standard silencer versus a cut-out silencer on a Goshawk II engine.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan112 | |
| Date | 12th October 1922 | |
| CUT OUT SILENCER FOR GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II. Lead pipe from manifold to silencer = 1 5/16" diam. Cut out tube = 1" diam. 72 5/16" holes in front section of Cut Out Tube. B.H.P. LOST TO SILENCER AND SWAN NECK B.H.P GAIN IN DOWN PIPE AND CUTOUT PIPE R.P.M. STANDARD SILENCER. CUT OUT SILENCER WITH 1 5/16 DOWN PIPE. B.H.P GAINED BY OPENING CUT OUT. A. {Mr Adams} J. {Mr Johnson W.M.} Lidsey | ||
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).