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).
Blueprint showing the results of a crack test on a B17 unit crankcase (top half).

Identifier  ExFiles\Box 132\3\  scan0064
Date  22th December 1936
  
B17 UNIT
CRANKCASE (TOP HALF)
RESULT OF CRACK TEST
DATE TESTED 22/12/36
Ex1103
SLIGHT CRACK (.100" LONG) BEGINNING HERE
CRACKS (.250" LONG) EXTEND DOWN INSIDE OF BORE THUS
SMALL CRACK (.200" LONG) EXTENDING DOWN INSIDE OF BORE THUS
No 4 BRG
No 7 BRG
No 4 BORE
No 6 BORE
CRACKS AT BOTTOM OF RADII AT BRGS 4 & 6 (ALSO VERY SMALL ONE ON THE N.S. OF No 1)
POSITION OF CRACKS IN RELATION TO RADII
EXTENT OF CRACK ON THE OFFSIDE OF No 4 BEARING (SAME BOTH SIDES OF WEB)
SCRAP VIEW IN DIRECTION OF ARROW A
ROLLS-ROYCE, LTD.
PLANT ROOM
DEC 29 1936
DERBY
CRANKCASE EB1697 MODº TO Ex 18253
FITTED 13/9/35
HAS DONE 119 HRS ON TEST BED
20 HRS OF WHICH AT 4000-4500 RPM 1/4 LOAD
40 HRS " " " " " " FULL LOAD
HAS RUN 22,000 MILES IN B23 AE
  
  


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