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).
Testing different methods for mounting radiators and V. stay tubes to the vehicle dash and chassis.
| Identifier | ExFiles\Box 119\2\ scan0348 | |
| Date | 6th June 1930 guessed | |
| VI Fig IV shows our original method used to fasten the V.{VIENNA} Stay Tubes to the dash. The tubes being held by the 2 centre scuttle bolts. As far as these were tested in England no radiator dither was recorded on 25EX, as with the type bolted to the dash as fig III a slight radiator dither became apparent immediately. This can be accounted for (a) The inertia of scuttle (b) a more flexible connection between the stay tubes and the dash. On the bumper we find the best results from the radiator control as fig X and hard rubbers on the chass. Sch. 1512. The radiator control as fig XI has been fitted to 58FM. During these tests on the bumper we have had no car with a centre mounted radiator as on N.2. Series to compare our results. On the bumper a radiator cross-member cracked after 23 hours running. This was due to the radiator continually hitting the cross-member, through not sufficient central mounting. The new cross-member has run 40 hours with no sign of failure, but in order to prevent the radiator from hitting the cross-member we had to give the radiator .625" movement each way (total 1.250") movement. measured from the stay tube bolts to the top water connection. When 25EA returned to Derby for 2 or 3 days we were very pleased to find that we can manage with much less movement on the centre mounting. In fact if the bumper chassis is fitted up with the same amount of movement as found to be satisfactory on 25EA had bonnet knocks and | ||