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 wind tunnel test report on the aerodynamic drag of Rolls-Bentley and Van Vooren-Bentley bodies.
| Identifier | ExFiles\Box 161\1\ scan0190 | |
| Date | 5th November 1937 | |
| Copy. Report No.X.283. 4 ft. W.T. M.X.69. ROLLS-ROYCE MOTOR CAR. 5.11.37. M.S. 1/8 and 1/10. Comparative Drags of Rolls-Bentley Body B.23.AE. and Van Vooren Body. The Rolls-Bentley body was identical with that tested in August 1933, with cycle type wings and vertical radiator ( see Rep. Ref.RKP/24155) and was 1/8 scale. As the two models were of different scales they could not be used for the "reflection" of one another. Instead a flat sheet of metal to represent the ground was placed under the model. The effect of this can be gathered from the previous report referred to above. The second model was to 1/10 scale and was well streamlined with a clean undershield. Model. Front Projected Area-Full Size sq.ft. Tunnel Speed. ft/sec. Tunnel Drag lbs. F.S. Drag at 100 mph. Tunnel K.{Mr Kilner} A.{Mr Adams} Rolls-Bentley. 19.025 (55 .6780 308 .00162 (70 1.0810 305 .00160 B. Van Vooren. 21.60 (55 .2264 161 .000745 (70 .3735 164 .000760 ---------- | ||