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).
Bench tests to investigate lag and hysteresis in thermostat radiator shutters.
| Identifier | ExFiles\Box 39\4\ Scan142 | |
| Date | 26th August 1930 | |
| To A.{Mr Adams} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to BS.{A J. Barnes - Assistant Manager} MOT. c. to RS.{Sir Henry Royce's Secretary} L. c. to BY.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} 3499 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/MJ.26.8.30. THERMOSTAT RADIATOR SHUTTERS. We have been conducting bench tests to ascertain why the thermostatically operated shutters have suffered from "lag" to the extent reported. The complaint was that after coasting down any long incline, the water temperature fell below that required for reasonable carburation, the hot spot having become cold. It was found that, in spite of the top water temperature falling as low as 50°C. the shutters had not started to close. Our experiments were directed to finding the hysterisis loss in the various components of the shutter system. Hysterisis in Calorstat Unit. We found that the only hysteris loss in the calorstat seemed to be in the guide which was liable to cross wind. The guide does not seem to be very essential in the latest "push pull" scheme and we think that at any rate it might with advantage have a considerable increase in clearance. Without Cover and Guide. With Cover and Guide. Load to start opening - 25 25 " fully open - 45 46 " hold fully open.- 45 40. " just prevent closing - 25 22. | ||