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).
Altering the shape of the double inlet and exhaust ports on the Goshawk 11 cylinder head to reduce noise.
| Identifier | ExFiles\Box 48\4\ Scan021 | |
| Date | 13th October 1921 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to BY.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} (X4227) E5/G13.10.21. X.4227 - RE GOSHAWK 11. CYLINDER HEAD - ALTERATION TO SHAPE X.4225 OF DOUBLE INLET AND EXHAUST PORTS TO REDUCE NOISE. We send you herewith drawing LeC.1465 shewing the double ports of the Goshawk 11. cylinder head made with a round contour where the point at present exists at the junction of the pockets. This, it is hoped, will modify the shape of the back water pipe, enlarging its mouth to such an extent that resonance will disappear. E.{Mr Elliott - Chief Engineer} | ||