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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).
Comparative chart of aerodynamic resistance data for various Rolls-Royce and Bentley car models.

Identifier  ExFiles\Box 161\1\  scan0197
Date  22th September 1938
  
AERODYNAMIC RESISTANCE.
ROLLS-ROYCE & BENTLEY CARS.

CAR:-
CHASSIS NUMBER
H.P. AT LAP SPEED.
LAP SPEEDS M.P.H.
FRONTAL AREA SQ. FT.
WGT. TONS
ACTUAL K
ACTUAL Cx{Major Len W. Cox - Advertising Manager}
'K' TUNNEL FLAT PLATE
'K' TUNNEL REFLEXN
REMARKS.

BENTLEY STD. SALOON | 2.B.3 | 92.5 | 85.0 | 23.400 | 1.70 | .00204 | .813 | .001695 | .00193
BENTLEY "STREAMLINE" | B-23-AE | 92.5 | 95.0 | 19.025 | 1.60 | .001845 | .722 | .00160 | .001725
BENTLEY - E.R. HALL. | B.35.AE | 92.5 | 90.0 | 15.000 | 1.40 | .00283 | 1.105 | .00190
BENTLEY - B.3. | 7.B.5 | 90.0 | 87.0 | 24.060 | 1.84 | .00195 | .764
BENTLEY - "PAULIN" | | 90.0 | 97.0 | 21.600 | 1.70 | .00154 | .524 | .00073
WRAITH - C.T.L. | | 65.0 | 74.0 | 27.270 | 2.05 | .0020 | .782
PHANTOM 3 - C.T.L | | 127.5 | 91.0 | 28.80 | 2.70 | .00205 | .803

Stamp Top Left (upside down):
ROLLS-ROYCE LTD.
PRINT ROOM
SEP 22 1938
DERBY.

Stamp Bottom Right:
ROLLS-ROYCE, LTD.
PRINT ROOM
SEP 22 1938
DERBY.
  
  


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