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).
Letter from Harrison Radiator Corporation discussing radiator core specifications and cooling test results for the Phantom lll.
| Identifier | ExFiles\Box 149a\3\ scan0192 | |
| Date | 7th October 1936 | |
| 1278 HARRISON RADIATOR CORPORATION LOCKPORT, NEW YORK October 7, 1936. Mr. C. S. Steadman Messrs. Rolls-Royce Ltd. Derby, Derbyshire, England Your reference: HS{Lord Ernest Hives - Chair}/Std.19/KW. Dear Mr. Steadman: Appreciate very much indeed your courtesy in answering my letter of August 18th so promptly and in extenuation regarding the critical air temperature figures for the Phantom lll car, wish to advise that the figures were included, however, there was no reference made to the actual speed obtained under the figure of maximum speed quoted which is the figure I was interested in and is contained in your letter of September 21st. As per my wire of recent date, we have tools here for building the .20 x .55 cores 3-1/4" or the .18 x .62 and 3-1/2" and as per advice from you will arrange to make up the .18 x .62 core as desired. We will not fit the side plates, as we are not sure which face should be maintained in the original position. Have gone over the figures attached to your letter which are the results of tests taken at Brooklands and which among other things you corroborate our information concerning the fitting of cowls. Referring specifically to the figures, No. 3 is the base having figures of 23° at 40 MPH. and 24° at maximum speed. No. 2 can be washed out as there is only 2° difference at 40 MPH and no difference at maximum speed. No. 1 can also be washed out, as it does not come up to No. 3 at any speed. No. 4 is the next best set providing the fan noise is not excessive, in which 4-1/2° are picked up at 40 MPH and 2° at 60 MPH. No. 6 is next in line again having fan noise as the criterion of value in which there are 5-1/2° pickup at 40 MPH and 2-1/2° at maximum speed. No. 5 is washed out completely because there are two changes made at the same time which cannot be evaluated. We next pass on to number 8 where the car was run with the 5-blade Cadillac fan, no cowls and without the bonnet. You will note particularly that the 40 MPH full load cooling is 1-1/2° better than the cooling at maximum speed which indicates very clearly indeed that the radiator does not have sufficient capacity, and comparing this particular test with No. 6, which is similar in every respect except the hood is fitted, there are 3-1/2° difference between the two tests at 40 MPH and 4° HEAT TRANSFER PRODUCTS AVIATION AUTOMOTIVE MARINE INDUSTRIAL RADIATORS SHUTTERS OIL TEMPERATURE REGULATORS CAR HEATERS THERMOSTATS HEAT EXCHANGERS | ||