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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).
Test report comparing performance, weight, and component specifications for vehicles GMD-20 and 20-G-IV.

Identifier  ExFiles\Box 102\1\  scan0252
Date  1st February 1935
  
-2-
Hs{Lord Ernest Hives - Chair}/GR.{George Ratcliffe}12/KW.1.2.35.

(4)
GMD-20. Carburetter LeC.4292 off 20-G-IV fitted as in test (2).
13.0 M.P.G./45.3 M.P.H./71 miles.

--------------------
GMD-20. Total weight complete T. 1 cwts. 19 qrs. 3 lbs. 21
20-G-IV. " " 1 16 1 14
Difference - - 3 2 7
--------------------

(5)
20-G-IV. Loaded to equal GMD-20 (1 - 19 - 3 - 21).
Carburetter LeC.4292 replaced as in Test (2) -
15.2 M.P.G./45.45 M.P.H./75 miles.

--------------------
GMD-20. Axle ratio 11 x 50. Tyres 6" x 19".
20-G-IV. " " 12 x 50. Tyres 6" x 18".

Hs{Lord Ernest Hives - Chair}/G.Ratcliffe.
  
  


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