Tests for cooling fan efficiency and steering issues related to tyre wear.
| Identifier | ExFiles\Box 11\2\ 02-page279 | |
| Date | 18th July 1929 | |
| To Hs. {Lord Ernest Hives - Chair} From G.W.H. Hôtel de France, Châteauroux, Indre. 18/7/29. 127 We have to-day been carrying out tests to prove our previous results with various positions of the fan. We have obtained definite results from numerous tests with the fan in the normal position and .750" from the matrix. The average of these results are that at high speeds the cooling efficiency is better with the fan in the normal position. We have tried various speeds, 40 M.P.H. 60 M.P.H. & 70 M.P.H. There is no appreciable difference whilst travelling at 40 M.P.H. with the fan in either position. At 60 M.P.H. there is a slight gain with the fan in the normal position. At 70 M.P.H. the cooling efficiency with the fan in the normal position is 4% greater than with the fan closer to the matrix. These results, as stated, form an average of 24 test runs, so that the figures are as accurate as it is possible to obtain. The atmospheric temperature did not vary more than 1/2°, the average being 33°C. We have also carried out steering tests, and once more the wear of tyres has definitely proved disastrous to steering. Towards the finish of the tests with the S.S. axle, the joggles became so bad, and the steering became very heavy. We went over all the various parts, and at last came to the conclusion that the worn tyres were giving us these results. We therefore changed the tyres, fitting practically new tyres in their place, with the result that the steering again became normal and very little joggling took place. Decreased friction on the cross steering tube gave us less joggles and no appreciable difference in the stability, with a consequent freer steering at slow speeds. We are now going to fit the packing pieces under the springs to bring it in line with the Phantom axle. G.W.H. | ||
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).