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).
Tests comparing the efficacy of the Hadees heater with an R.H. shield against the A.C. heater.
| Identifier | ExFiles\Box 137\3\ scan0254 | |
| Date | 5th February 1941 | |
| To Rm.{William Robotham - Chief Engineer} From Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham} C. to Rm{William Robotham - Chief Engineer}/Wgm. & Rm{William Robotham - Chief Engineer}/Col. HEATERS. A series of tests has been carried out on 1-R-1; in the first place to determine the efficacy of the R.H. shield on the Hadees heater, and in the second place to compare the Hadees with the A.C. heater. The tests do show that the shield does some good in warming up the interior of the body a little more quickly. Against this, however, must be set the fact that the driver's left foot gets unpleasantly hot as can be seen from the curves 1.B and 2.B in fig.2. In addition it will be seen from curves 1.C, 2.C and 3.C in fig.2 that the rear passengers really cannot tell the difference when the shield is in use. The A.C. heater was not expected to compare well with the Hadees. From the curves there does not seem to be very much difference, but, in fact, on the road the A.C. seems definitely inadequate for a car of the size of 1-R-1. It just warms one's feet sufficiently, but one cannot dispense with one's overcoat as can be done quite comfortably with the Hadees. Summing up we do not consider that the shield is worth having on the Hadees. We consider that the A.C. heater should be quite good on a small car but it must be born in mind that there are no defroster connections on it. Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham} | ||