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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).
The unsatisfactory performance of Wraith piston rings and a directive for a revised assembly.

Identifier  ExFiles\Box 9\1\  01-page06
Date  12th January 1938
  
To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}
c. By/CS.
c. HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}

[Handwritten]: 636

Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}10/MH.{M. Huckerby}12.1.38.

WRAITH PISTON ASSEMBLY.

We find that the performance of rings EW.1536 and the 'L' section rings made from EW.1536 is not quite as satisfactory as expected, and therefore require further investigation.

Will you, therefore, arrange to have the first six cars already being built to be assembled to the present 25/30 Piston L.O.P. This we recommend should also apply to the first 100 sets of material ordered.

Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}
  
  


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