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).
Comparing car rolling resistance (K-value) with competitors and outlining future wind tunnel testing plans.
| Identifier | ExFiles\Box 161\1\ scan0195 | |
| Date | 22th September 1938 | |
| -3- Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}8/N.22.9.38 Cont'd.{John DeLooze - Company Secretary} (c) -Continued. It is essential that we should unearth the truth about rolling resistance both on the track and on the dynamometer if we are to be able to compare the K.{Mr Kilner} of various cars by track tests. As suggested by Rm.{William Robotham - Chief Engineer} we have written to Sr. with a view to hearing what Michelin have to say, and also to Messrs. Dunlops. We have also cabled Hs{Lord Ernest Hives - Chair}/LS. in America. (d) Data, Up-to-Date. On the attached print we have collected together all the track and tunnel data which we have obtained up-to-date, both of our cars and others. The Cx{Major Len W. Cox - Advertising Manager} (Continental) equals 391 times K.{Mr Kilner}(English) The Peugeot 402, Caréné exhibited at the Salon in 1936 and which we quote has a Cx{Major Len W. Cox - Advertising Manager} value which is now quite common for saloons of this type in France, such as the Grand Prix Delage and the Delahaye (see Rm{William Robotham - Chief Engineer}5/R.22.2.38) The Immediate Future. (1) When you have obtained final track and dynamometer figures for the Paulin car we have got to co-ordinate our car and tunnel tests so that we can proceed with wind tunnel testing with success. (2) We must learn all we can from America and French exponents, and this we are doing by direct contact. (3) The Bentley has got to have a Saloon body with a reduced 'K' and we have got to evolve it. [Signature] EV.{Ivan Evernden - coachwork} | ||