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).
Issues with R.K. modifications, particularly concerning the horns and horn relay.
| Identifier | ExFiles\Box 168a\4\ img032 | |
| Date | 17th August 1937 guessed | |
| was due to the R.K. modification carried out on it. This is, to some extent true, but in the first place, the modifications made, were necessary to the safety of the dynamo, and system in general; and in the second place, R.R. are not responsible for the falling characteristic of the regulator, which they already object to, on other grounds, and which if rectified, would probably largely overcome the lag trouble on the cutout. It was asked whether the makers thought they could overcome the lag-in-operation trouble, but no definite answer was given. It was then asked whether the makers would be prepared to supply the regulator as a separate unit apart from the cutout. The reply was to the effect that the makers would undoubtedly do this. Horns - The position of this unit was summed up to Mr. Thacker as follows :- The present R.R. standard horn, i.e. the WT.11X type, with louvres in the trumpet, was satisfactory as regards volume and penetration of sound. It was still however subject to failure as the result of heavy mist or rain being driven into and blocking the throat of the trumpet. To overcome this, an elbow had been introduced at the junction of trumpet to body; but this unfortunately lowered the pitch of the horn, and consequently to some extent its penetrating powers. Also there was possibly some reduction in volume of sound. Efforts were being made to overcome this by redesigning the spiral in the body. Horn relay. Mr. Thacker was informed that there had been a case of the contacts on the second stage welding together, and as a result the makers had promised to supply a unit for test fitted with larger contacts. He was also told that faults on production units occured too frequently. These faults were of three kinds, i.e. failure to sound loud; failure to sound soft; insulation breakdown, resulting in failure to sound at all. Mr. Thacker replied that arrangements were being made to tighten up inspection of these units. | ||