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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).
Testing of 14-tooth axles and compression ratios on 40/50 cars.

Identifier  ExFiles\Box 25\3\  Scan083
Date  20th July 1922
  
To Hs.{Lord Ernest Hives - Chair} from BJ.

- 2 -

BJ13/H20.7.22

and substitute another type of belt?
Should this be referred to H?

Satisfactory 40/50 Cars. We hope that when we have had an opportunity of testing some cars with medium compression and 14-tooth axles, we shall be able to submit to you a car which appears to us to be silky, silent and satisfactory.

14-tooth Axles. We look forward to hearing the results of the tests made at Brooklands, which we hope will enable us to decide on a policy of standardising cars with low compression and 14-tooth axles, which we hope will give adequate life, speed, silence and absence of vibration.

When PN.{Mr Northey} returned from the South of France, after thoroughly testing the 14-tooth axle, he impressed on us very forcibly that he was convinced that we need no longer consider customers who required more than about 60 miles an hour, as there were only few of these and we might be misled by these few, who shout loudest, that motorists as a general rule require higher speeds than 60 m.p.h.

The tests made by you to obtain information of the extra speed obtained by high compression over medium compression show that the high compression gives such a slight advantage, (and then only at speeds over 60 m.p.h.) that it is not worth considering if the high compression is likely to increase the vibration on the average.

B.J.
  
  


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