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 Ferodo Limited reporting on the performance results of fan and belt tests.
| Identifier | ExFiles\Box 135\1\ scan0214 | |
| Date | 7th October 1938 guessed | |
| From FERODO LIMITED. Sheet No. 2 C. S. Steadman Esq., Messrs. Rolls Royce Ltd. The second fan you sent ran an hour and a quarter on the Gates belt, when the conditions were:- 246 volts 78 amps i.e. an average consumption of 21.9 H.P. [Handwritten correction: 19.1] This second fan ran an additional 4-1/4 hrs. with the Dayton Cog belt when the average conditions were:- 247 volts 67 amps i.e. 18.9 H.P. [Handwritten correction: 16.1] The third fan, which was returned to you showing a sign of bending on one blade,(which bending you stated was there when you first sent it to us), was then fitted and ran a further 3 hours with the Dayton Cog belt with average figures of:- 248 volts 86 amps and a fan speed of 4,150 (This speed is low because, as previously reported, the Dayton Cog belt was showing 8% slip). These figures indicate a H.P. consumption of 24.3. These figures are certainly lower than those originally passed to you in my letter of September 22nd but I think you will find that the alterations in the present letter are correct. [Handwritten insertion: figures] Yours truly, FERODO LIMITED [Signature] Chief Chemist & Director. | ||