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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}
  
  


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