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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).
Investigation into a hot rear seat on the 4.B.50 model, recommending a heat shield for the exhaust system.

Identifier  ExFiles\Box 144\4\  scan0069
Date  15th April 1940
  
500a
Sg.{Arthur F. Sidgreaves - MD} from Rm.{William Robotham - Chief Engineer}
c, Ev.{Ivan Evernden - coachwork}
Rm.{William Robotham - Chief Engineer}18/ML.15.4.40.
HOT REAR SEAT. 4.B.50.
Our investigation confirms that the rear seat of the 4.B.50 does get very hot due to the proximity of the exhaust system.
It will be necessary to fit a shield over the exhaust system similar to the one which we had on production on Phantom 2 and 3.
Rm.{William Robotham - Chief Engineer}
  
  


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