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).
Reducing exhaust boom, recommending Scheme 564 for future production over Scheme 563.
| Identifier | ExFiles\Box 48\4\ Scan225 | |
| Date | 26th September 1924 | |
| B.B. 405A (ROH) (D.A. 652 20-2-24) J.B.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs {Lord Ernest Hives - Chair} /TMW/LG26.9.24. reduction of the exhaust boom noticeable around 35 to 30 m.p.h., a cure however is not claimed for this noise. Scheme 564 is recommended for standardisation on future production as being a better proposition, the Silencer being solidly compressed to the Cross Member, whereas, it is only suspended solidly from the Cross Member on Scheme 563. The latter however can be used successfully if it is desired to fit up an existing car with the improvement without going to the extent of drilling the Cross Member. Scheme 564 was fitted to 7-G-11 - has run 7,840 miles. " 563 " " 6-G-11 - " 3,600 miles. Neither have given trouble. Hs {Lord Ernest Hives - Chair} /TMW. | ||