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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).
Comparison of carburetter flooding on a gradient between the Wraith and 25/30 models.

Identifier  ExFiles\Box 109\5\  scan0070
Date  16th July 1938
  
664

SECRET.

Sg.{Arthur F. Sidgreaves - MD} from Rm.{William Robotham - Chief Engineer}

Rml2/R.16.7.38.

Wraith Carburetter Flooding on a Gradient.

We have now completed some comparisons between the Wraith and the 25/30 flooding on a gradient.

The present 25/30 starts to flood on an upward gradient of 1 in 14½, the Wraith on an upward gradient of 1 in 7½. When the carburetter does flood owing to the high pressure petrol pump used in the Wraith, rather more fuel is passed into the Induction Pipe. We cannot detect, however, that a hot start is any more difficult on the Wraith on a gradient of 1 in 7½ than on the 25/30.

Rm.{William Robotham - Chief Engineer}
  
  


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