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).
The design and efficiency of various Goshawk engine silencers, including a new design with a cutout.
| Identifier | WestWitteringFiles\I\October1922\ Scan44 | |
| Date | 4th October 1922 | |
| Hs{Lord Ernest Hives - Chair}6/T4.10.22. -2- Contd. suffer as regards resfriction in power and restriction in noise. The present standard Goshawk silencer has three diaphragm baffles and the inlet and outlet pipes extend into the silencer and form fourth and fifth baffles. These perforated pipes form very efficient silencing baffles - we have proved this point on the 40/50 which has a baffle made in the same way. The silencer with cutout has three diaphragm baffles only. We added two more baffles to this silencer and made the holes similar to those we have in the inlet and outlet pipes. We found even with this, the silencer was noticeably more noisy than the present standard silencer. We have tried a silencer and cutout made in the following manner :- This is very efficient. It has the advantage that it has the same degree of silence as we have with the present standard silencer. With the cutout open it suffers from the fish-tail outlet, otherwise it is excellent as regards power and noise. Contd. | ||