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).
Investigation into the cause of a roar in the Goshawk 11 induction system by comparing it with the Goshawk 1.
| Identifier | ExFiles\Box 48\4\ Scan018 | |
| Date | 10th October 1921 | |
| To R from Hs.{Lord Ernest Hives - Chair} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} X4227 Hs{Lord Ernest Hives - Chair}4/LG10.10.21. X.4219 - GOSHAWK 11. X.4227. With reference to your telegram of the 7th.inst. We have carried out further tests and have narrowed down the possible cause of the roar in the induction system. We have compared Goshawk 1. and Goshawk 11. cars on the road without any induction pipe or carburetter fitted; the air passing straight into the induction ports. The difference in the noise caused by the air passing into the cylinders under these conditions, is tremendous. The difference is that on Goshawk 11., there is a roar which drowns all other noises, whereas on Goshawk 1. we had to life the floorboards to make certain that the engine was being turned round because of the comparatively little noise. We tested Goshawk 11. to try and find whether it was any particular inlet port which was causing the noise. We tested to see whether it was the inside double ports which were the worst. Our conclusion after these tests is that all six cylinders help to make the noise. When we had Nos. 3 and 4 cylinders only sucking, it seemed to be worse but this might easily be attributed to the period of the suctions. The results of all our tests appear to show that it is the gas or air entering the cylinder which is the cause of the noise. Hs.{Lord Ernest Hives - Chair} | ||