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).
Summary of cooling tests and proposals for radiator matrix and fan configurations on a Bentley car.
| Identifier | ExFiles\Box 155\1\ scan0167 | |
| Date | 24th October 1934 guessed | |
| -2- (3) From sheet (3) is seen the difference in our intake temperature under full throttle conditions with the two methods of temperature control, and this difference falls as the power output of the engine increases. (4) From sheet (4) it is seen that when 6" depth has been blanked off the bottom of the 58 m.m. Marston Mark V matrix, the cooling is approximately equal to that obtained with the standard matrix. (5) Sheet (5) shows the cooling comparisons with a standard Bentley fan, a Peregrine fan, a staggered 20/25 type fan (60° between adjacent blades) and no fan fitted, together with corresponding lap speeds. Summary. As mentioned above, we propose to consult the makers as to the lack of difference between their 58 m.m. and 70 m.m. matrices. In view of (4), last paragraph, we think that 6" of matrix could safely be removed from the base of the 58 m.m. Marston Mark V matrix, while still keeping ample cooling for the Bentley car. We shall endeavour to run such a matrix on the next 10,000 miles Bentley. Such a matrix would give a total saving in weight of approx. 24 lbs. over present standard matrix. We think that the present type Bentley fan should be adhered to, especially if the suggested matrix is adopted, in order to ensure freedom from boiling while idling or hill climbing on the indirect gears. Hs{Lord Ernest Hives - Chair}/C.S.Steadman. | ||