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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).
Performance results of a 1.EX Car tested at Brooklands with 14-tooth and 15-tooth axles.

Identifier  ExFiles\Box 29\3\  Scan103
Date  13th September 1922
  
[Handwritten] X788
[Handwritten] X788 / X3763

To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c. to CJ.
c. to BJ.
c. to Da.{Bernard Day - Chassis Design}

Hs{Lord Ernest Hives - Chair}7/LG13.9.22.

Herewith results obtained on Brooklands with
1.EX Car fitted with a 14 tooth axle with high and low
compression and a 15 tooth axle - high and low compression.
The results show practically no difference in maximum
speeds with the 14-tooth axle compared with the 15-tooth
axle.

We are not satisfied with the results because
they do not agree with the previous set of tests taken on
Brooklands. The 15-tooth axle results are not as good
as we obtained then.

We consider however the results show that the car
fitted with the 14-tooth axle will give the best performance,
under all reasonable conditions.

107-MG car came on the Track when we were there
and we timed that car to do a lap at 71 m.p.h. This car
was fitted with a 14 tooth axle and low compression.

Hs.{Lord Ernest Hives - Chair}
  
  


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