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).
Problems with existing exhaust heaters and proposing an alternative design using a screw steam cock.
| Identifier | WestWitteringFiles\E\November1920\ Scan26 | |
| Date | 4th November 1920 | |
| R.R. 235A (100 T) (S.H. 159, 11-8-20) G 2800 HEATER EXH To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to P. c. to DA.{Bernard Day - Chassis Design} c. to EWT. for P. RECEIVED ORIGINAL HES/LC4.11.20. X 3506 EXHAUST HEATERS. X 4005 We have been frequently asked by America and also occasionally asked by Sales Dept. whether we could recommend an Exhaust Heater. We have previously reported on Exhaust Heaters supplied from America and Sales pointing out their deficiencies. We should anticipate that quite a number of customers will demand exhaust heaters, especially in very cold countries. It does not seem reasonable to expect passengers to sit and freeze in a car without making an attempt to make use of the heat which is available from the exhaust. Our opinion is that the weakness in all exhaust heaters we have seen is the valve; these are always of the butterfly type operated by means of either a rod or wires. The chief trouble with the valves comes about due to the fact that the exhaust pressure is intermittent and that if there is any slack or wear on the valve it causes a rattle. On one of our experimental cars we have taken a pipe from the exhaust and run it round inside the body and then let it exhaust at the rear of the car. For a valve we have used an ordinary screw steam cock. We have found that this works very well. The advantages with it are, we consider:- 1. Positive type valve which can be definitely shut off or regulated accurately. Contd. [Handwritten on side] HS{Lord Ernest Hives - Chair} LOGIC SIMPLIFIED DRAFT | ||