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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).
Confirming exhaust boom issues on a 38-EX Long Wheelbase Phantom III car.

Identifier  ExFiles\Box 96\3\  scan0138
Date  24th December 1936
  
360

Sg.{Arthur F. Sidgreaves - MD} from Rm.{William Robotham - Chief Engineer}
c. to Hs.{Lord Ernest Hives - Chair}

Rm{William Robotham - Chief Engineer}3/R.24.12.36.

38-EX - LONG WHEELBASE P.III.

We confirm that this car is suffering badly from exhaust booms. We believe that this is due to the exhaust system having been lengthened to suit the altered chassis length, and that it has spoiled its acoustic properties.

A certain amount of experimental work will have to be carried out to put the matter right, and we shall not, therefore, be sending the car back to London immediately after the holidays.

Rm.{William Robotham - Chief Engineer}
  
  


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