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 diagram illustrating a crack in a B4 unit's left-hand crankcase after extensive testing in France.
| Identifier | ExFiles\Box 83\2\ scan0043 | |
| Date | 21th May 1937 | |
| B4 UNIT. ExI 154 CRANKCASE LH.{Mr Haworth} EB185'S SMALL CRACK JUST BEGINNING. A LARGER CRACK WAS FOUND IN THE SAME PLACE WHEN C17 UNIT WAS INSPECTED AFTER TESTS IN FRANCE (SEE ExI 156) CRACKED CRANKCASE (LH{Mr Haworth}) AFTER 16,000 MILES IN FRANCE ExI 154 ROLLS-ROYCE, LTD. PRINT ROOM, 21 MAY 1937 DERBY CAW 29-5-37 | ||