Rolls-Royce Archives
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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).
Table correlating car speed in M.P.H. with the R.P.M. of various components for an axle ratio of 4.25.

Identifier  ExFiles\Box 173\3\  img064
Date  26th October 1933
  
CAR SPEED vs.{J. Vickers} ENGINE R.P.M., ETC.
- 40S -
AXLE RATIO 4.25

Car Speed M.P.H. Factor | Engine R.P.M. | Camshaft Distributor R.P.M. .5 | Generator R.P.M. 1.51 | Water Pump R.P.M. 1.3 | Rear Wheel R.P.M. .82
5 | 271 | 135 | 409 | 352 | 59.9
10 | 542 | 271 | 819 | 705 | 119.1
15 | 813 | 406 | 1228 | 1057 | 178.7
20 | 1084 | 542 | 1637 | 1410 | 238.3
25 | 1355 | 677 | 2047 | 1762 | 297.9
30 | 1627 | 813 | 2456 | 2114 | 357.5
35 | 1898 | 949 | 2865 | 2467 | 417.0
40 | 2169 | 1084 | 3275 | 2819 | 476.6
45 | 2440 | 1220 | 3684 | 3171 | 536.2
50 | 2711 | 1355 | 4094 | 3524 | 595.8
55 | 2982 | 1491 | 4503 | 3876 | 655.4
60 | 3253 | 1626 | 4912 | 4229 | 715.0
65 | 3524 | 1762 | 5321 | 4581 | 774.5
70 | 3795 | 1897 | 5731 | 4933 | 834.1
75 | 4066 | 2033 | 6140 | 5286 | 893.7
80 | 4337 | 2168 | 6550 | 5638 | 953.3
82 | 4445 | 2222 | 6714 | 5779 | 977.1

* No account is taken of slippage.

10-26-33
  
  


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