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 | ||
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).