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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).
Speed test results for various axle, engine, and carburetter configurations.

Identifier  ExFiles\Box 29\3\  Scan347
Date  27th August 1931
  
To Hs.{Lord Ernest Hives - Chair} from F.{Mr Friese} Dodd.
In File 8788.
12-GIV. 27.8.31.

11 tooth Axle and Standard engine.
Standard carburetter with louvred bonnet and plain.
Lap Speed. 1/2 mile Speed.
65.87 M.P.H. 65.69 M.P.H.

11 tooth Axle and Standard engine. S.U. Carburetter.
Lap Speed. 1/2 mile Speed.
67.57 M.P.H. 68.18 M.P.H.

11 tooth Axle - Special engine. Standard carburetter.
(Handwritten note: About correct timing when this test was taken)
Lap Speed. 1/2 mile Speed.
72.49 M.P.H. 75 M.P.H. - cut out closed.
73.45 " 77.25 M.P.H. - cut out open.

11 tooth Axle - special engine. S.U. carburetter.
Lap Speed. 1/2 mile Speed.
75.23 M.P.H. 75 M.P.H. - cut out closed.
76.62 M.P.H. 76.92 " - cut out open.

12 tooth Axle - special engine. Standard carburetter.
Lap Speed. 1/2 mile Speed.
73.6 M.P.H. 75.0 M.P.H. - cut out closed.
73.6 M.P.H. 76.6 " - cut out open.

12 tooth Axle - special engine. S.U. carburetter.
Lap Speed. 1/2 mile Speed.
76.39 M.P.H. 80.36 M.P.H. - cut out closed.
78.43 " 80.36 " - cut out open.
  
  


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