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).
Comparison and analysis of the 'Thermorad' and 'Perfection' car heaters, detailing disadvantages and design features.
| Identifier | WestWitteringFiles\D\February1920\ Scan19 | |
| Date | 2nd February 1920 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}4/LG12.2.20. impinge direct on to the surface of the heater. With this heater, we found that it would get up to 60 or 70°C with the car running under traffic conditions. If the car was running full power for any length of time, it was necessary to partially close the valve or it became uncomfortably hot. We do not consider the Thermorad heater is a very good specimen of Exhaust Heater. The disadvantages with it are - 1. The Heater is a cast aluminium box and is intended to be let into the floor of the car. Unless it is protected by a grid, it would easily be possible, if the engine was running full power, for either Rugs, Coats or Shoes to be burnt by contact with it. 2. There are several core holes in the box on which joints are made by means of flanges, fixed with two screws. If these leak, the exhaust gases would probably get into the body of the car. 3. The valve is a very poor design. 4. The workmanship of the whole of the parts is very poor. 5. It is possible, on a quiet road, to hear an exhaust noise from the heater. "Perfection" Heater This is a much better heater than the "Thermorad". The Heater in this case consists of a nest of seven 1" dia. steel tubes in parallel. The tubes are retained in position by end castings. The Heater is let into a pressed steel pan and covered with an aluminium grid. The valve is the butter-fly type. The fitting for the valve is made to fit on to our 3" exhaust pipes. There are flexible steel pipes supplied which carry the exhaust gases to the Heater and from there to the rear of the car. This Heater is quite effective under Contd. R.R. 235 A (100) T (S.P) 846 6-6-19 C. 2460 | ||